1979940 has 24 divisors (see below), whose sum is σ = 5544000. Its totient is φ = 527968.

The previous prime is 1979911. The next prime is 1979941. The reversal of 1979940 is 499791.

It is not an unprimeable number, because it can be changed into a prime (1979941) 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, 16440 + ... + 16559.

It is an arithmetic number, because the mean of its divisors is an integer number (231000).

2^1979940 is an apocalyptic number.

1979940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1979940 is an abundant number, since it is smaller than the sum of its proper divisors (3564060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1979940 is a wasteful number, since it uses less digits than its factorization.

1979940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33011 (or 33009 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 1979940 is about 1407.1034077139. The cubic root of 1979940 is about 125.5694551604.

The spelling of 1979940 in words is "one million, nine hundred seventy-nine thousand, nine hundred forty".