138355402 has 16 divisors (see below), whose sum is σ = 215776512. Its totient is φ = 66480480.

The previous prime is 138355337. The next prime is 138355403. The reversal of 138355402 is 204553831.

It is not an unprimeable number, because it can be changed into a prime (138355403) 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 7 ways as a sum of consecutive naturals, for example, 7098 + ... + 18085.

It is an arithmetic number, because the mean of its divisors is an integer number (13486032).

Almost surely, 2^138355402 is an apocalyptic number.

138355402 is a deficient number, since it is larger than the sum of its proper divisors (77421110).

138355402 is a wasteful number, since it uses less digits than its factorization.

138355402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25293.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 138355402 is about 11762.4573112934. The cubic root of 138355402 is about 517.2081664180.

The spelling of 138355402 in words is "one hundred thirty-eight million, three hundred fifty-five thousand, four hundred two".