138402680 has 32 divisors (see below), whose sum is σ = 335361600. Its totient is φ = 51102336.

The previous prime is 138402659. The next prime is 138402683. The reversal of 138402680 is 86204831.

138402680 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138402683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132560 + ... + 133599.

It is an arithmetic number, because the mean of its divisors is an integer number (10480050).

Almost surely, 2^138402680 is an apocalyptic number.

138402680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138402680 is an abundant number, since it is smaller than the sum of its proper divisors (196958920).

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

138402680 is a wasteful number, since it uses less digits than its factorization.

138402680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266183 (or 266179 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 138402680 is about 11764.4668387479. The cubic root of 138402680 is about 517.2670721603.

The spelling of 138402680 in words is "one hundred thirty-eight million, four hundred two thousand, six hundred eighty".