138762440 has 16 divisors (see below), whose sum is σ = 312215580. Its totient is φ = 55504960.

The previous prime is 138762439. The next prime is 138762443. The reversal of 138762440 is 44267831.

It can be written as a sum of positive squares in 2 ways, for example, as 121837444 + 16924996 = 11038^2 + 4114^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 138762440.

It is not an unprimeable number, because it can be changed into a prime (138762443) 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, 1734491 + ... + 1734570.

Almost surely, 2^138762440 is an apocalyptic number.

138762440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138762440 is an abundant number, since it is smaller than the sum of its proper divisors (173453140).

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

138762440 is a wasteful number, since it uses less digits than its factorization.

138762440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3469072 (or 3469068 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 138762440 is about 11779.7470261462. The cubic root of 138762440 is about 517.7148741671.

The spelling of 138762440 in words is "one hundred thirty-eight million, seven hundred sixty-two thousand, four hundred forty".