1691972 has 24 divisors (see below), whose sum is σ = 3157056. Its totient is φ = 791648.

The previous prime is 1691939. The next prime is 1691983. The reversal of 1691972 is 2791961.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4703 + ... + 5049.

It is an arithmetic number, because the mean of its divisors is an integer number (131544).

2^1691972 is an apocalyptic number.

It is an amenable number.

1691972 is a deficient number, since it is larger than the sum of its proper divisors (1465084).

1691972 is a wasteful number, since it uses less digits than its factorization.

1691972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 425 counting only the distinct ones).

The product of its digits is 6804, while the sum is 35.

The square root of 1691972 is about 1300.7582404121. The cubic root of 1691972 is about 119.1601543922.

The spelling of 1691972 in words is "one million, six hundred ninety-one thousand, nine hundred seventy-two".