40125390138 has 12 divisors (see below), whose sum is σ = 86938345338. Its totient is φ = 13375130040.

The previous prime is 40125390131. The next prime is 40125390157. The reversal of 40125390138 is 83109352104.

It can be written as a sum of positive squares in only one way, i.e., 22905914409 + 17219475729 = 151347^2 + 131223^2 .

It is a super-2 number, since 2×40125390138² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40125390131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1114594153 + ... + 1114594188.

Almost surely, 2^40125390138 is an apocalyptic number.

40125390138 is an abundant number, since it is smaller than the sum of its proper divisors (46812955200).

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

40125390138 is a wasteful number, since it uses less digits than its factorization.

40125390138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229188349 (or 2229188346 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 40125390138 in words is "forty billion, one hundred twenty-five million, three hundred ninety thousand, one hundred thirty-eight".