2138574690 has 128 divisors (see below), whose sum is σ = 6529835520. Its totient is φ = 487897344.

The previous prime is 2138574689. The next prime is 2138574727. The reversal of 2138574690 is 964758312.

2138574690 is a `hidden beast` number, since 2 + 13 + 8 + 574 + 69 + 0 = 666.

2138574690 is digitally balanced in base 6 and base 10, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2138574690² = 9147003409417192200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

2138574690 is strictly pandigital in base 10.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1914012 + ... + 1915128.

It is an arithmetic number, because the mean of its divisors is an integer number (51014340).

It is a 1-persistent number, because it is pandigital, but 2⋅2138574690 = 4277149380 is not.

Almost surely, 2^2138574690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2138574690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3264917760).

2138574690 is an abundant number, since it is smaller than the sum of its proper divisors (4391260830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2138574690 is a wasteful number, since it uses less digits than its factorization.

2138574690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2153 (or 2147 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 2138574690 is about 46244.7260776837. The cubic root of 2138574690 is about 1288.3725827104.

The spelling of 2138574690 in words is "two billion, one hundred thirty-eight million, five hundred seventy-four thousand, six hundred ninety".