1397979 has 24 divisors (see below), whose sum is σ = 2288832. Its totient is φ = 845640.

The previous prime is 1397959. The next prime is 1397983. The reversal of 1397979 is 9797931.

It is not a de Polignac number, because 1397979 - 2¹² = 1393883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397909) 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, 2412 + ... + 2934.

It is an arithmetic number, because the mean of its divisors is an integer number (95368).

2^1397979 is an apocalyptic number.

1397979 is a deficient number, since it is larger than the sum of its proper divisors (890853).

1397979 is an equidigital number, since it uses as much as digits as its factorization.

1397979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549 (or 537 counting only the distinct ones).

The product of its digits is 107163, while the sum is 45.

The square root of 1397979 is about 1182.3616198101. The cubic root of 1397979 is about 111.8150380383.

It can be divided in two parts, 139 and 7979, that added together give a palindrome (8118).

The spelling of 1397979 in words is "one million, three hundred ninety-seven thousand, nine hundred seventy-nine".