861998946 has 16 divisors (see below), whose sum is σ = 1725357024. Its totient is φ = 287106464.

The previous prime is 861998903. The next prime is 861998959. The reversal of 861998946 is 649899168.

It is a super-2 number, since 2×861998946² = 1486084365810221832, which contains 22 as substring.

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 861998946.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48291 + ... + 63686.

It is an arithmetic number, because the mean of its divisors is an integer number (107834814).

Almost surely, 2^861998946 is an apocalyptic number.

861998946 is an abundant number, since it is smaller than the sum of its proper divisors (863358078).

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

861998946 is a wasteful number, since it uses less digits than its factorization.

861998946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113265.

The product of its digits is 6718464, while the sum is 60.

The square root of 861998946 is about 29359.8185621097. The cubic root of 861998946 is about 951.7047676021.

The spelling of 861998946 in words is "eight hundred sixty-one million, nine hundred ninety-eight thousand, nine hundred forty-six".