138811842 has 24 divisors (see below), whose sum is σ = 323894844. Its totient is φ = 42711264.

The previous prime is 138811819. The next prime is 138811843. The reversal of 138811842 is 248118831.

It can be written as a sum of positive squares in 2 ways, for example, as 138791961 + 19881 = 11781^2 + 141^2 .

It is a junction number, because it is equal to n+sod(n) for n = 138811797 and 138811806.

It is not an unprimeable number, because it can be changed into a prime (138811843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 296373 + ... + 296840.

Almost surely, 2^138811842 is an apocalyptic number.

138811842 is an abundant number, since it is smaller than the sum of its proper divisors (185083002).

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

138811842 is a wasteful number, since it uses less digits than its factorization.

138811842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593234 (or 593231 counting only the distinct ones).

The product of its digits is 12288, while the sum is 36.

The square root of 138811842 is about 11781.8437436591. The cubic root of 138811842 is about 517.7763055737.

The spelling of 138811842 in words is "one hundred thirty-eight million, eight hundred eleven thousand, eight hundred forty-two".