863909972 has 6 divisors (see below), whose sum is σ = 1511842458. Its totient is φ = 431954984.

The previous prime is 863909941. The next prime is 863909987. The reversal of 863909972 is 279909368.

It can be written as a sum of positive squares in only one way, i.e., 809061136 + 54848836 = 28444^2 + 7406^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107988743 + ... + 107988750.

It is an arithmetic number, because the mean of its divisors is an integer number (251973743).

Almost surely, 2^863909972 is an apocalyptic number.

It is an amenable number.

863909972 is a deficient number, since it is larger than the sum of its proper divisors (647932486).

863909972 is a wasteful number, since it uses less digits than its factorization.

863909972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215977497 (or 215977495 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 53.

The square root of 863909972 is about 29392.3454661243. The cubic root of 863909972 is about 952.4075488879.

The spelling of 863909972 in words is "eight hundred sixty-three million, nine hundred nine thousand, nine hundred seventy-two".