1979780 has 24 divisors (see below), whose sum is σ = 4536000. Its totient is φ = 719840.

The previous prime is 1979779. The next prime is 1979807. The reversal of 1979780 is 879791.

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, 4280 + ... + 4719.

It is an arithmetic number, because the mean of its divisors is an integer number (189000).

2^1979780 is an apocalyptic number.

1979780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1979780 is an abundant number, since it is smaller than the sum of its proper divisors (2556220).

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

1979780 is a wasteful number, since it uses less digits than its factorization.

1979780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9019 (or 9017 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 41.

The square root of 1979780 is about 1407.0465521794. The cubic root of 1979780 is about 125.5660726246.

The spelling of 1979780 in words is "one million, nine hundred seventy-nine thousand, seven hundred eighty".