138651804 has 48 divisors (see below), whose sum is σ = 360138240. Its totient is φ = 46131120.

The previous prime is 138651803. The next prime is 138651817. The reversal of 138651804 is 408156831.

138651804 is a `hidden beast` number, since 138 + 6 + 518 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138651803) 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, 86797 + ... + 88379.

It is an arithmetic number, because the mean of its divisors is an integer number (7502880).

Almost surely, 2^138651804 is an apocalyptic number.

It is an amenable number.

138651804 is an abundant number, since it is smaller than the sum of its proper divisors (221486436).

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

138651804 is a wasteful number, since it uses less digits than its factorization.

138651804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2407 (or 2399 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 138651804 is about 11775.0500635878. The cubic root of 138651804 is about 517.5772453481.

The spelling of 138651804 in words is "one hundred thirty-eight million, six hundred fifty-one thousand, eight hundred four".