1390185888 has 144 divisors (see below), whose sum is σ = 4516416576. Its totient is φ = 366612480.

The previous prime is 1390185883. The next prime is 1390185947. The reversal of 1390185888 is 8885810931.

It is a self number, because there is not a number n which added to its sum of digits gives 1390185888.

It is not an unprimeable number, because it can be changed into a prime (1390185883) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107448 + ... + 119688.

It is an arithmetic number, because the mean of its divisors is an integer number (31364004).

Almost surely, 2^1390185888 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 1390185888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2258208288).

1390185888 is an abundant number, since it is smaller than the sum of its proper divisors (3126230688).

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

1390185888 is a wasteful number, since it uses less digits than its factorization.

1390185888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12287 (or 12266 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 51.

The square root of 1390185888 is about 37285.1966335166. The cubic root of 1390185888 is about 1116.0687769949.

The spelling of 1390185888 in words is "one billion, three hundred ninety million, one hundred eighty-five thousand, eight hundred eighty-eight".