19722019 has 4 divisors (see below), whose sum is σ = 20760040. Its totient is φ = 18684000.

The previous prime is 19722013. The next prime is 19722047. The reversal of 19722019 is 91022791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91022791 = 157 ⋅579763.

It is a cyclic number.

It is not a de Polignac number, because 19722019 - 2¹⁵ = 19689251 is a prime.

It is a super-2 number, since 2×19722019² = 777916066872722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19722013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 518982 + ... + 519019.

It is an arithmetic number, because the mean of its divisors is an integer number (5190010).

Almost surely, 2^19722019 is an apocalyptic number.

19722019 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

19722019 is a deficient number, since it is larger than the sum of its proper divisors (1038021).

19722019 is a wasteful number, since it uses less digits than its factorization.

19722019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038020.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 19722019 is about 4440.9479843835. The cubic root of 19722019 is about 270.1782955875.

The spelling of 19722019 in words is "nineteen million, seven hundred twenty-two thousand, nineteen".