1979620 has 12 divisors (see below), whose sum is σ = 4157244. Its totient is φ = 791840.

The previous prime is 1979617. The next prime is 1979683. The reversal of 1979620 is 269791.

It can be written as a sum of positive squares in 2 ways, for example, as 381924 + 1597696 = 618^2 + 1264^2 .

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, 49471 + ... + 49510.

It is an arithmetic number, because the mean of its divisors is an integer number (346437).

2^1979620 is an apocalyptic number.

1979620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1979620 is an abundant number, since it is smaller than the sum of its proper divisors (2177624).

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

1979620 is a wasteful number, since it uses less digits than its factorization.

1979620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98990 (or 98988 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 1979620 is about 1406.9896943475. The cubic root of 1979620 is about 125.5626899065.

The spelling of 1979620 in words is "one million, nine hundred seventy-nine thousand, six hundred twenty".