138667420 has 12 divisors (see below), whose sum is σ = 291201624. Its totient is φ = 55466960.

The previous prime is 138667411. The next prime is 138667423. The reversal of 138667420 is 24766831.

138667420 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 138667420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138667423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3466666 + ... + 3466705.

It is an arithmetic number, because the mean of its divisors is an integer number (24266802).

Almost surely, 2^138667420 is an apocalyptic number.

138667420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138667420 is an abundant number, since it is smaller than the sum of its proper divisors (152534204).

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

138667420 is a wasteful number, since it uses less digits than its factorization.

138667420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6933380 (or 6933378 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 138667420 is about 11775.7131418866. The cubic root of 138667420 is about 517.5966757549.

The spelling of 138667420 in words is "one hundred thirty-eight million, six hundred sixty-seven thousand, four hundred twenty".