2138545956 has 48 divisors (see below), whose sum is σ = 5196320640. Its totient is φ = 683692800.

The previous prime is 2138545939. The next prime is 2138545963. The reversal of 2138545956 is 6595458312.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32200 + ... + 72896.

It is an arithmetic number, because the mean of its divisors is an integer number (108256680).

Almost surely, 2^2138545956 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2138545956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2598160320).

2138545956 is an abundant number, since it is smaller than the sum of its proper divisors (3057774684).

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

2138545956 is a wasteful number, since it uses less digits than its factorization.

2138545956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40884 (or 40882 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 48.

The square root of 2138545956 is about 46244.4154033760. The cubic root of 2138545956 is about 1288.3668124711.

The spelling of 2138545956 in words is "two billion, one hundred thirty-eight million, five hundred forty-five thousand, nine hundred fifty-six".