138508004 has 18 divisors (see below), whose sum is σ = 248571414. Its totient is φ = 67491360.

The previous prime is 138507989. The next prime is 138508009. The reversal of 138508004 is 400805831.

It can be written as a sum of positive squares in only one way, i.e., 84456100 + 54051904 = 9190^2 + 7352^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138508009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 150257 + ... + 151175.

It is an arithmetic number, because the mean of its divisors is an integer number (13809523).

Almost surely, 2^138508004 is an apocalyptic number.

It is an amenable number.

138508004 is a deficient number, since it is larger than the sum of its proper divisors (110063410).

138508004 is an frugal number, since it uses more digits than its factorization.

138508004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883 (or 962 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 138508004 is about 11768.9423484016. The cubic root of 138508004 is about 517.3982517566.

The spelling of 138508004 in words is "one hundred thirty-eight million, five hundred eight thousand, four".