1979901 has 24 divisors (see below), whose sum is σ = 3566784. Its totient is φ = 1028160.

The previous prime is 1979899. The next prime is 1979911. The reversal of 1979901 is 1099791.

It is not a de Polignac number, because 1979901 - 2¹ = 1979899 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 736 + ... + 2121.

It is an arithmetic number, because the mean of its divisors is an integer number (148616).

2^1979901 is an apocalyptic number.

1979901 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1979901 is a deficient number, since it is larger than the sum of its proper divisors (1586883).

1979901 is a wasteful number, since it uses less digits than its factorization.

1979901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2881 (or 2878 counting only the distinct ones).

The product of its (nonzero) digits is 5103, while the sum is 36.

The square root of 1979901 is about 1407.0895493891. The cubic root of 1979901 is about 125.5686306841.

The spelling of 1979901 in words is "one million, nine hundred seventy-nine thousand, nine hundred one".