1997157744 has 30 divisors (see below), whose sum is σ = 5589268256. Its totient is φ = 665719200.

The previous prime is 1997157737. The next prime is 1997157779. The reversal of 1997157744 is 4477517991.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6934432 + ... + 6934719.

Almost surely, 2^1997157744 is an apocalyptic number.

It is an amenable number.

1997157744 is an abundant number, since it is smaller than the sum of its proper divisors (3592110512).

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

1997157744 is a wasteful number, since it uses less digits than its factorization.

1997157744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13869165 (or 13869156 counting only the distinct ones).

The product of its digits is 2222640, while the sum is 54.

The square root of 1997157744 is about 44689.5708639051. The cubic root of 1997157744 is about 1259.3239305839.

The spelling of 1997157744 in words is "one billion, nine hundred ninety-seven million, one hundred fifty-seven thousand, seven hundred forty-four".