138696420 has 48 divisors (see below), whose sum is σ = 392370048. Its totient is φ = 36602880.

The previous prime is 138696407. The next prime is 138696427. The reversal of 138696420 is 24696831.

It is not an unprimeable number, because it can be changed into a prime (138696427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6096 + ... + 17735.

It is an arithmetic number, because the mean of its divisors is an integer number (8174376).

Almost surely, 2^138696420 is an apocalyptic number.

138696420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138696420 is an abundant number, since it is smaller than the sum of its proper divisors (253673628).

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

138696420 is a wasteful number, since it uses less digits than its factorization.

138696420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23940 (or 23938 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 138696420 is about 11776.9444254441. The cubic root of 138696420 is about 517.6327555044.

The spelling of 138696420 in words is "one hundred thirty-eight million, six hundred ninety-six thousand, four hundred twenty".