861965406 has 24 divisors (see below), whose sum is σ = 1877275920. Its totient is φ = 285831936.

The previous prime is 861965387. The next prime is 861965413. The reversal of 861965406 is 604569168.

It is a super-2 number, since 2×861965406² = 1485968722281489672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120586 + ... + 127533.

It is an arithmetic number, because the mean of its divisors is an integer number (78219830).

Almost surely, 2^861965406 is an apocalyptic number.

861965406 is an abundant number, since it is smaller than the sum of its proper divisors (1015310514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861965406 is a wasteful number, since it uses less digits than its factorization.

861965406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248320 (or 248317 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 861965406 is about 29359.2473677375. The cubic root of 861965406 is about 951.6924239707.

The spelling of 861965406 in words is "eight hundred sixty-one million, nine hundred sixty-five thousand, four hundred six".