19979428 has 24 divisors (see below), whose sum is σ = 40444992. Its totient is φ = 8458464.

The previous prime is 19979419. The next prime is 19979441. The reversal of 19979428 is 82497991.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1975 + ... + 6622.

It is an arithmetic number, because the mean of its divisors is an integer number (1685208).

Almost surely, 2^19979428 is an apocalyptic number.

It is an amenable number.

19979428 is an abundant number, since it is smaller than the sum of its proper divisors (20465564).

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

19979428 is a wasteful number, since it uses less digits than its factorization.

19979428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8691 (or 8689 counting only the distinct ones).

The product of its digits is 326592, while the sum is 49.

The square root of 19979428 is about 4469.8353437235. The cubic root of 19979428 is about 271.3486613992.

The spelling of 19979428 in words is "nineteen million, nine hundred seventy-nine thousand, four hundred twenty-eight".