18540401 has 8 divisors (see below), whose sum is σ = 20558208. Its totient is φ = 16578000.

The previous prime is 18540383. The next prime is 18540427. The reversal of 18540401 is 10404581.

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

It is a cyclic number.

It is not a de Polignac number, because 18540401 - 2¹⁴ = 18524017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18540481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13145 + ... + 14486.

It is an arithmetic number, because the mean of its divisors is an integer number (2569776).

Almost surely, 2^18540401 is an apocalyptic number.

18540401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18540401 is a deficient number, since it is larger than the sum of its proper divisors (2017807).

18540401 is a wasteful number, since it uses less digits than its factorization.

18540401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27703.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 18540401 is about 4305.8565930602. The cubic root of 18540401 is about 264.6710097977.

Adding to 18540401 its reverse (10404581), we get a palindrome (28944982).

The spelling of 18540401 in words is "eighteen million, five hundred forty thousand, four hundred one".