1178138900 has 18 divisors (see below), whose sum is σ = 2556561630. Its totient is φ = 471255520.

The previous prime is 1178138881. The next prime is 1178138917. The reversal of 1178138900 is 98318711.

It can be written as a sum of positive squares in 3 ways, for example, as 81072016 + 1097066884 = 9004^2 + 33122^2 .

It is a super-2 number, since 2×1178138900² = 2776022535386420000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5890595 + ... + 5890794.

Almost surely, 2^1178138900 is an apocalyptic number.

1178138900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1178138900 is an abundant number, since it is smaller than the sum of its proper divisors (1378422730).

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

1178138900 is a wasteful number, since it uses less digits than its factorization.

1178138900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11781403 (or 11781396 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 38.

The square root of 1178138900 is about 34324.0280270250. The cubic root of 1178138900 is about 1056.1659578570.

The spelling of 1178138900 in words is "one billion, one hundred seventy-eight million, one hundred thirty-eight thousand, nine hundred".