138996040 has 16 divisors (see below), whose sum is σ = 312741180. Its totient is φ = 55598400.

The previous prime is 138995999. The next prime is 138996041. The reversal of 138996040 is 40699831.

It can be written as a sum of positive squares in 2 ways, for example, as 137030436 + 1965604 = 11706^2 + 1402^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 3474901 = 138996040 / (1 + 3 + 8 + 9 + 9 + 6 + 0 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 138995984 and 138996002.

It is not an unprimeable number, because it can be changed into a prime (138996041) 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, 1737411 + ... + 1737490.

Almost surely, 2^138996040 is an apocalyptic number.

138996040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138996040 is an abundant number, since it is smaller than the sum of its proper divisors (173745140).

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

138996040 is a wasteful number, since it uses less digits than its factorization.

138996040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3474912 (or 3474908 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 138996040 is about 11789.6581799474. The cubic root of 138996040 is about 518.0052274583.

The spelling of 138996040 in words is "one hundred thirty-eight million, nine hundred ninety-six thousand, forty".