18572401 has 4 divisors (see below), whose sum is σ = 18742900. Its totient is φ = 18401904.

The previous prime is 18572399. The next prime is 18572417. The reversal of 18572401 is 10427581.

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 9928801 + 8643600 = 3151^2 + 2940^2 .

It is a cyclic number.

It is not a de Polignac number, because 18572401 - 2¹ = 18572399 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 18572401.

It is not an unprimeable number, because it can be changed into a prime (18572461) 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, 85086 + ... + 85303.

It is an arithmetic number, because the mean of its divisors is an integer number (4685725).

Almost surely, 2^18572401 is an apocalyptic number.

It is an amenable number.

18572401 is a deficient number, since it is larger than the sum of its proper divisors (170499).

18572401 is a wasteful number, since it uses less digits than its factorization.

18572401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170498.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 18572401 is about 4309.5708603062. The cubic root of 18572401 is about 264.8231928478.

Adding to 18572401 its reverse (10427581), we get a palindrome (28999982).

The spelling of 18572401 in words is "eighteen million, five hundred seventy-two thousand, four hundred one".