939190639 has 4 divisors (see below), whose sum is σ = 940147056. Its totient is φ = 938234224.

The previous prime is 939190633. The next prime is 939190643. The reversal of 939190639 is 936091939.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 939190639 - 2⁹ = 939190127 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 939190592 and 939190601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (939190633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476734 + ... + 478699.

It is an arithmetic number, because the mean of its divisors is an integer number (235036764).

Almost surely, 2^939190639 is an apocalyptic number.

939190639 is a deficient number, since it is larger than the sum of its proper divisors (956417).

939190639 is an equidigital number, since it uses as much as digits as its factorization.

939190639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956416.

The product of its (nonzero) digits is 354294, while the sum is 49.

The square root of 939190639 is about 30646.2173685432. The cubic root of 939190639 is about 979.3048794772.

The spelling of 939190639 in words is "nine hundred thirty-nine million, one hundred ninety thousand, six hundred thirty-nine".