1649997172 has 24 divisors (see below), whose sum is σ = 2925601056. Its totient is φ = 814134048.

The previous prime is 1649997163. The next prime is 1649997179. The reversal of 1649997172 is 2717999461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649997179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360603 + ... + 365149.

It is an arithmetic number, because the mean of its divisors is an integer number (121900044).

Almost surely, 2^1649997172 is an apocalyptic number.

It is an amenable number.

1649997172 is a deficient number, since it is larger than the sum of its proper divisors (1275603884).

1649997172 is a wasteful number, since it uses less digits than its factorization.

1649997172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5727 (or 5725 counting only the distinct ones).

The product of its digits is 1714608, while the sum is 55.

The square root of 1649997172 is about 40620.1572128912. The cubic root of 1649997172 is about 1181.6650753660.

The spelling of 1649997172 in words is "one billion, six hundred forty-nine million, nine hundred ninety-seven thousand, one hundred seventy-two".