139305808 has 10 divisors (see below), whose sum is σ = 269905034. Its totient is φ = 69652896.

The previous prime is 139305799. The next prime is 139305833. The reversal of 139305808 is 808503931.

It can be written as a sum of positive squares in only one way, i.e., 132894784 + 6411024 = 11528^2 + 2532^2 .

It is a super-2 number, since 2×139305808² = 38812216285065728, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4353291 + ... + 4353322.

Almost surely, 2^139305808 is an apocalyptic number.

It is an amenable number.

139305808 is a deficient number, since it is larger than the sum of its proper divisors (130599226).

139305808 is an equidigital number, since it uses as much as digits as its factorization.

139305808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8706621 (or 8706615 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 139305808 is about 11802.7881451799. The cubic root of 139305808 is about 518.3897525346.

The spelling of 139305808 in words is "one hundred thirty-nine million, three hundred five thousand, eight hundred eight".