18401291 has 16 divisors (see below), whose sum is σ = 20106240. Its totient is φ = 16783200.

The previous prime is 18401287. The next prime is 18401297. The reversal of 18401291 is 19210481.

It is a cyclic number.

It is not a de Polignac number, because 18401291 - 2² = 18401287 is a prime.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 18401291.

It is not an unprimeable number, because it can be changed into a prime (18401297) 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, 82406 + ... + 82628.

It is an arithmetic number, because the mean of its divisors is an integer number (1256640).

Almost surely, 2^18401291 is an apocalyptic number.

18401291 is a deficient number, since it is larger than the sum of its proper divisors (1704949).

18401291 is a wasteful number, since it uses less digits than its factorization.

18401291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 18401291 is about 4289.6725982294. The cubic root of 18401291 is about 264.0073985912.

The spelling of 18401291 in words is "eighteen million, four hundred one thousand, two hundred ninety-one".