1979391 has 16 divisors (see below), whose sum is σ = 2747520. Its totient is φ = 1266720.

The previous prime is 1979387. The next prime is 1979399. The reversal of 1979391 is 1939791.

It is not a de Polignac number, because 1979391 - 2² = 1979387 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9276 + ... + 9486.

It is an arithmetic number, because the mean of its divisors is an integer number (171720).

2^1979391 is an apocalyptic number.

1979391 is a deficient number, since it is larger than the sum of its proper divisors (768129).

1979391 is a wasteful number, since it uses less digits than its factorization.

1979391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326.

The product of its digits is 15309, while the sum is 39.

The square root of 1979391 is about 1406.9083125776. The cubic root of 1979391 is about 125.5578480741.

The spelling of 1979391 in words is "one million, nine hundred seventy-nine thousand, three hundred ninety-one".