869143990 has 64 divisors (see below), whose sum is σ = 1845752832. Its totient is φ = 290505600.

The previous prime is 869143981. The next prime is 869144021. The reversal of 869143990 is 99341968.

It is a super-2 number, since 2×869143990² = 1510822550706240200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 374935 + ... + 377245.

It is an arithmetic number, because the mean of its divisors is an integer number (28839888).

Almost surely, 2^869143990 is an apocalyptic number.

869143990 is an abundant number, since it is smaller than the sum of its proper divisors (976608842).

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

869143990 is a wasteful number, since it uses less digits than its factorization.

869143990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2605.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 869143990 is about 29481.2481079075. The cubic root of 869143990 is about 954.3270717871.

The spelling of 869143990 in words is "eight hundred sixty-nine million, one hundred forty-three thousand, nine hundred ninety".