138734440 has 32 divisors (see below), whose sum is σ = 336165480. Its totient is φ = 51224832.

The previous prime is 138734389. The next prime is 138734461. The reversal of 138734440 is 44437831.

It can be written as a sum of positive squares in 4 ways, for example, as 121044004 + 17690436 = 11002^2 + 4206^2 .

It is a super-2 number, since 2×138734440² = 38494489684227200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138734396 and 138734405.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132879 + ... + 133918.

Almost surely, 2^138734440 is an apocalyptic number.

138734440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138734440 is an abundant number, since it is smaller than the sum of its proper divisors (197431040).

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

138734440 is a wasteful number, since it uses less digits than its factorization.

138734440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266821 (or 266817 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 138734440 is about 11778.5584856552. The cubic root of 138734440 is about 517.6800496819.

The spelling of 138734440 in words is "one hundred thirty-eight million, seven hundred thirty-four thousand, four hundred forty".