19979406 has 32 divisors (see below), whose sum is σ = 45158400. Its totient is φ = 6545880.

The previous prime is 19979363. The next prime is 19979411. The reversal of 19979406 is 60497991.

It is a super-2 number, since 2×19979406² = 798353328225672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51 + ... + 6321.

It is an arithmetic number, because the mean of its divisors is an integer number (1411200).

Almost surely, 2^19979406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19979406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22579200).

19979406 is an abundant number, since it is smaller than the sum of its proper divisors (25178994).

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

19979406 is a wasteful number, since it uses less digits than its factorization.

19979406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6341 (or 6335 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 19979406 is about 4469.8328827821. The cubic root of 19979406 is about 271.3485618022.

The spelling of 19979406 in words is "nineteen million, nine hundred seventy-nine thousand, four hundred six".