18321401 has 16 divisors (see below), whose sum is σ = 21712896. Its totient is φ = 15132096.

The previous prime is 18321389. The next prime is 18321419. The reversal of 18321401 is 10412381.

It is a de Polignac number, because none of the positive numbers 2^k-18321401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18321431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32615 + ... + 33171.

It is an arithmetic number, because the mean of its divisors is an integer number (1357056).

Almost surely, 2^18321401 is an apocalyptic number.

It is an amenable number.

18321401 is a deficient number, since it is larger than the sum of its proper divisors (3391495).

18321401 is a wasteful number, since it uses less digits than its factorization.

18321401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 18321401 is about 4280.3505697548. The cubic root of 18321401 is about 263.6247778247.

Adding to 18321401 its reverse (10412381), we get a palindrome (28733782).

The spelling of 18321401 in words is "eighteen million, three hundred twenty-one thousand, four hundred one".