1977172 has 12 divisors (see below), whose sum is σ = 3610656. Its totient is φ = 945560.

The previous prime is 1977163. The next prime is 1977187. The reversal of 1977172 is 2717791.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10654 + ... + 10837.

It is an arithmetic number, because the mean of its divisors is an integer number (300888).

2^1977172 is an apocalyptic number.

It is an amenable number.

1977172 is a deficient number, since it is larger than the sum of its proper divisors (1633484).

1977172 is a wasteful number, since it uses less digits than its factorization.

1977172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21518 (or 21516 counting only the distinct ones).

The product of its digits is 6174, while the sum is 34.

The square root of 1977172 is about 1406.1194828321. The cubic root of 1977172 is about 125.5109115765.

The spelling of 1977172 in words is "one million, nine hundred seventy-seven thousand, one hundred seventy-two".