999697924 has 9 divisors (see below), whose sum is σ = 1749582037. Its totient is φ = 499817344.

The previous prime is 999697891. The next prime is 999697961. The reversal of 999697924 is 429796999.

The square root of 999697924 is 31618.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 36216324 + 963481600 = 6018^2 + 31040^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 55332 + ... + 71140.

Almost surely, 2^999697924 is an apocalyptic number.

999697924 is the 31618-th square number.

It is an amenable number.

999697924 is a deficient number, since it is larger than the sum of its proper divisors (749884113).

999697924 is an frugal number, since it uses more digits than its factorization.

999697924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31622 (or 15811 counting only the distinct ones).

The product of its digits is 19840464, while the sum is 64.

The cubic root of 999697924 is about 999.8992978594.

Multiplying 999697924 by its sum of digits (64), we get a square (63980667136 = 252944²).

The spelling of 999697924 in words is "nine hundred ninety-nine million, six hundred ninety-seven thousand, nine hundred twenty-four".