19878422 has 4 divisors (see below), whose sum is σ = 29817636. Its totient is φ = 9939210.

The previous prime is 19878413. The next prime is 19878433. The reversal of 19878422 is 22487891.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×19878422² = 790303322420168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19878422.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4969604 + ... + 4969607.

It is an arithmetic number, because the mean of its divisors is an integer number (7454409).

Almost surely, 2^19878422 is an apocalyptic number.

19878422 is a deficient number, since it is larger than the sum of its proper divisors (9939214).

19878422 is an equidigital number, since it uses as much as digits as its factorization.

19878422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9939213.

The product of its digits is 64512, while the sum is 41.

The square root of 19878422 is about 4458.5224009755. The cubic root of 19878422 is about 270.8906209282.

The spelling of 19878422 in words is "nineteen million, eight hundred seventy-eight thousand, four hundred twenty-two".