997408772 has 12 divisors (see below), whose sum is σ = 1758206940. Its totient is φ = 495063936.

The previous prime is 997408771. The next prime is 997408807. The reversal of 997408772 is 277804799.

It can be written as a sum of positive squares in 2 ways, for example, as 236421376 + 760987396 = 15376^2 + 27586^2 .

It is not an unprimeable number, because it can be changed into a prime (997408771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 909497 + ... + 910592.

It is an arithmetic number, because the mean of its divisors is an integer number (146517245).

Almost surely, 2^997408772 is an apocalyptic number.

It is an amenable number.

997408772 is a deficient number, since it is larger than the sum of its proper divisors (760798168).

997408772 is a wasteful number, since it uses less digits than its factorization.

997408772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1820230 (or 1820228 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 53.

The square root of 997408772 is about 31581.7791139131. The cubic root of 997408772 is about 999.1355102061.

The spelling of 997408772 in words is "nine hundred ninety-seven million, four hundred eight thousand, seven hundred seventy-two".