1138902388 has 12 divisors (see below), whose sum is σ = 2146393060. Its totient is φ = 525647232.

The previous prime is 1138902383. The next prime is 1138902451. The reversal of 1138902388 is 8832098311.

It can be written as a sum of positive squares in 2 ways, for example, as 237221604 + 901680784 = 15402^2 + 30028^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138902383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10950933 + ... + 10951036.

Almost surely, 2^1138902388 is an apocalyptic number.

It is an amenable number.

1138902388 is a deficient number, since it is larger than the sum of its proper divisors (1007490672).

1138902388 is a wasteful number, since it uses less digits than its factorization.

1138902388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21901986 (or 21901984 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 1138902388 is about 33747.6278870086. The cubic root of 1138902388 is about 1044.3085519977.

The spelling of 1138902388 in words is "one billion, one hundred thirty-eight million, nine hundred two thousand, three hundred eighty-eight".