1920172 has 6 divisors (see below), whose sum is σ = 3360308. Its totient is φ = 960084.

The previous prime is 1920161. The next prime is 1920173. The reversal of 1920172 is 2710291.

It is not an unprimeable number, because it can be changed into a prime (1920173) by changing a digit.

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 as a sum of consecutive naturals, namely, 240018 + ... + 240025.

2^1920172 is an apocalyptic number.

It is an amenable number.

1920172 is a deficient number, since it is larger than the sum of its proper divisors (1440136).

1920172 is a wasteful number, since it uses less digits than its factorization.

1920172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480047 (or 480045 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 1920172 is about 1385.7027098191. The cubic root of 1920172 is about 124.2930115439.

The spelling of 1920172 in words is "one million, nine hundred twenty thousand, one hundred seventy-two".