19220401 has 4 divisors (see below), whose sum is σ = 19410804. Its totient is φ = 19030000.

The previous prime is 19220363. The next prime is 19220407. The reversal of 19220401 is 10402291.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15610401 + 3610000 = 3951^2 + 1900^2 .

It is a cyclic number.

It is not a de Polignac number, because 19220401 - 2⁷ = 19220273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19220407) 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, 95050 + ... + 95251.

It is an arithmetic number, because the mean of its divisors is an integer number (4852701).

Almost surely, 2^19220401 is an apocalyptic number.

It is an amenable number.

19220401 is a deficient number, since it is larger than the sum of its proper divisors (190403).

19220401 is a wasteful number, since it uses less digits than its factorization.

19220401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190402.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 19220401 is about 4384.1077769599. The cubic root of 19220401 is about 267.8679874450.

Adding to 19220401 its reverse (10402291), we get a palindrome (29622692).

The spelling of 19220401 in words is "nineteen million, two hundred twenty thousand, four hundred one".