839490861 has 24 divisors (see below), whose sum is σ = 1231971552. Its totient is φ = 508103200.

The previous prime is 839490803. The next prime is 839490887. The reversal of 839490861 is 168094938.

It is not a de Polignac number, because 839490861 - 2¹⁰ = 839489837 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 839490861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (839490061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 462646 + ... + 464456.

It is an arithmetic number, because the mean of its divisors is an integer number (51332148).

Almost surely, 2^839490861 is an apocalyptic number.

It is an amenable number.

839490861 is a deficient number, since it is larger than the sum of its proper divisors (392480691).

839490861 is a wasteful number, since it uses less digits than its factorization.

839490861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3113 (or 3102 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 839490861 is about 28973.9686787986. The cubic root of 839490861 is about 943.3481256308.

The spelling of 839490861 in words is "eight hundred thirty-nine million, four hundred ninety thousand, eight hundred sixty-one".