939481639 has 2 divisors, whose sum is σ = 939481640. Its totient is φ = 939481638.

The previous prime is 939481601. The next prime is 939481681. The reversal of 939481639 is 936184939.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-939481639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (939481139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 469740819 + 469740820.

It is an arithmetic number, because the mean of its divisors is an integer number (469740820).

Almost surely, 2^939481639 is an apocalyptic number.

939481639 is a deficient number, since it is larger than the sum of its proper divisors (1).

939481639 is an equidigital number, since it uses as much as digits as its factorization.

939481639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1259712, while the sum is 52.

The square root of 939481639 is about 30650.9647319624. The cubic root of 939481639 is about 979.4060120484.

The spelling of 939481639 in words is "nine hundred thirty-nine million, four hundred eighty-one thousand, six hundred thirty-nine".