1979091 has 12 divisors (see below), whose sum is σ = 2889432. Its totient is φ = 1305216.

The previous prime is 1979077. The next prime is 1979101. The reversal of 1979091 is 1909791.

It is not a de Polignac number, because 1979091 - 2¹⁴ = 1962707 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1979051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 261 + ... + 2006.

It is an arithmetic number, because the mean of its divisors is an integer number (240786).

2^1979091 is an apocalyptic number.

1979091 is a deficient number, since it is larger than the sum of its proper divisors (910341).

1979091 is a wasteful number, since it uses less digits than its factorization.

1979091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2370 (or 2367 counting only the distinct ones).

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

The square root of 1979091 is about 1406.8016917818. The cubic root of 1979091 is about 125.5515044971.

Subtracting from 1979091 its sum of digits (36), we obtain a triangular number (1979055 = T₁₉₈₉).

It can be divided in two parts, 19790 and 91, that added together give a square (19881 = 141²).

The spelling of 1979091 in words is "one million, nine hundred seventy-nine thousand, ninety-one".