1978372 has 12 divisors (see below), whose sum is σ = 3776976. Its totient is φ = 899240.

The previous prime is 1978363. The next prime is 1978393. The reversal of 1978372 is 2738791.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22438 + ... + 22525.

It is an arithmetic number, because the mean of its divisors is an integer number (314748).

2^1978372 is an apocalyptic number.

It is an amenable number.

1978372 is a deficient number, since it is larger than the sum of its proper divisors (1798604).

1978372 is a wasteful number, since it uses less digits than its factorization.

1978372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44978 (or 44976 counting only the distinct ones).

The product of its digits is 21168, while the sum is 37.

The square root of 1978372 is about 1406.5461243770. The cubic root of 1978372 is about 125.5362984478.

The spelling of 1978372 in words is "one million, nine hundred seventy-eight thousand, three hundred seventy-two".