997659772 has 6 divisors (see below), whose sum is σ = 1745904608. Its totient is φ = 498829884.

The previous prime is 997659731. The next prime is 997659787. The reversal of 997659772 is 277956799.

It is a self number, because there is not a number n which added to its sum of digits gives 997659772.

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, 124707468 + ... + 124707475.

Almost surely, 2^997659772 is an apocalyptic number.

It is an amenable number.

997659772 is a deficient number, since it is larger than the sum of its proper divisors (748244836).

997659772 is a wasteful number, since it uses less digits than its factorization.

997659772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249414947 (or 249414945 counting only the distinct ones).

The product of its digits is 15002820, while the sum is 61.

The square root of 997659772 is about 31585.7526742676. The cubic root of 997659772 is about 999.2193146890.

The spelling of 997659772 in words is "nine hundred ninety-seven million, six hundred fifty-nine thousand, seven hundred seventy-two".