1979406 has 48 divisors (see below), whose sum is σ = 5045040. Its totient is φ = 552960.

The previous prime is 1979399. The next prime is 1979413. The reversal of 1979406 is 6049791.

It is an interprime number because it is at equal distance from previous prime (1979399) and next prime (1979413).

It is a super-2 number, since 2×1979406² = 7836096225672, which contains 22 as substring.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2190 + ... + 2958.

It is an arithmetic number, because the mean of its divisors is an integer number (105105).

2^1979406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1979406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2522520).

1979406 is an abundant number, since it is smaller than the sum of its proper divisors (3065634).

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

1979406 is a wasteful number, since it uses less digits than its factorization.

1979406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801 (or 798 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 1979406 is about 1406.9136434053. The cubic root of 1979406 is about 125.5581652361.

The spelling of 1979406 in words is "one million, nine hundred seventy-nine thousand, four hundred six".