19976421 has 8 divisors (see below), whose sum is σ = 26672224. Its totient is φ = 13299120.

The previous prime is 19976399. The next prime is 19976423. The reversal of 19976421 is 12467991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19976421 - 2¹³ = 19968229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19976421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19976423) by changing a digit.

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, 1870 + ... + 6591.

It is an arithmetic number, because the mean of its divisors is an integer number (3334028).

Almost surely, 2^19976421 is an apocalyptic number.

It is an amenable number.

19976421 is a deficient number, since it is larger than the sum of its proper divisors (6695803).

19976421 is an equidigital number, since it uses as much as digits as its factorization.

19976421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9251.

The product of its digits is 27216, while the sum is 39.

The square root of 19976421 is about 4469.4989652085. The cubic root of 19976421 is about 271.3350476234.

The spelling of 19976421 in words is "nineteen million, nine hundred seventy-six thousand, four hundred twenty-one".