1697641972 has 12 divisors (see below), whose sum is σ = 3199402276. Its totient is φ = 783527040.

The previous prime is 1697641931. The next prime is 1697641999. The reversal of 1697641972 is 2791467961.

It can be written as a sum of positive squares in 2 ways, for example, as 100520676 + 1597121296 = 10026^2 + 39964^2 .

It is a Harshad number since it is a multiple of its sum of digits (52), and also a Moran number because the ratio is a prime number: 32646961 = 1697641972 / (1 + 6 + 9 + 7 + 6 + 4 + 1 + 9 + 7 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16323429 + ... + 16323532.

Almost surely, 2^1697641972 is an apocalyptic number.

It is an amenable number.

1697641972 is a deficient number, since it is larger than the sum of its proper divisors (1501760304).

1697641972 is a wasteful number, since it uses less digits than its factorization.

1697641972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32646978 (or 32646976 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 52.

The square root of 1697641972 is about 41202.4510435969. The cubic root of 1697641972 is about 1192.9311195768.

The spelling of 1697641972 in words is "one billion, six hundred ninety-seven million, six hundred forty-one thousand, nine hundred seventy-two".