138232420 has 12 divisors (see below), whose sum is σ = 290288124. Its totient is φ = 55292960.

The previous prime is 138232411. The next prime is 138232421. The reversal of 138232420 is 24232831.

It can be written as a sum of positive squares in 2 ways, for example, as 64513024 + 73719396 = 8032^2 + 8586^2 .

It is not an unprimeable number, because it can be changed into a prime (138232421) 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 3 ways as a sum of consecutive naturals, for example, 3455791 + ... + 3455830.

It is an arithmetic number, because the mean of its divisors is an integer number (24190677).

Almost surely, 2^138232420 is an apocalyptic number.

138232420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138232420 is an abundant number, since it is smaller than the sum of its proper divisors (152055704).

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

138232420 is a wasteful number, since it uses less digits than its factorization.

138232420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6911630 (or 6911628 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 138232420 is about 11757.2284148944. The cubic root of 138232420 is about 517.0548748476.

The spelling of 138232420 in words is "one hundred thirty-eight million, two hundred thirty-two thousand, four hundred twenty".