138492040 has 16 divisors (see below), whose sum is σ = 311607180. Its totient is φ = 55396800.

The previous prime is 138492031. The next prime is 138492043. The reversal of 138492040 is 40294831.

It can be written as a sum of positive squares in 2 ways, for example, as 131928196 + 6563844 = 11486^2 + 2562^2 .

It is a junction number, because it is equal to n+sod(n) for n = 138491993 and 138492011.

It is not an unprimeable number, because it can be changed into a prime (138492043) 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, 1731111 + ... + 1731190.

Almost surely, 2^138492040 is an apocalyptic number.

138492040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138492040 is an abundant number, since it is smaller than the sum of its proper divisors (173115140).

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

138492040 is a wasteful number, since it uses less digits than its factorization.

138492040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3462312 (or 3462308 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 138492040 is about 11768.2641030867. The cubic root of 138492040 is about 517.3783730906.

The spelling of 138492040 in words is "one hundred thirty-eight million, four hundred ninety-two thousand, forty".