18662401 has 8 divisors (see below), whose sum is σ = 19076904. Its totient is φ = 18251520.

The previous prime is 18662383. The next prime is 18662411. The reversal of 18662401 is 10426681.

It is a Cunningham number, because it is equal to 4320²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 608400 + 18054001 = 780^2 + 4249^2 .

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 18662401 - 2²¹ = 16565249 is a prime.

It is a super-2 number, since 2×18662401² = 696570422169602, which contains 22 as substring.

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 18662401.

It is not an unprimeable number, because it can be changed into a prime (18662411) 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, 11241 + ... + 12793.

It is an arithmetic number, because the mean of its divisors is an integer number (2384613).

Almost surely, 2^18662401 is an apocalyptic number.

It is an amenable number.

18662401 is a deficient number, since it is larger than the sum of its proper divisors (414503).

18662401 is a wasteful number, since it uses less digits than its factorization.

18662401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1811.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 18662401 is about 4320.0001157407. Note that the first 3 decimals coincide. The cubic root of 18662401 is about 265.2502726398.

The spelling of 18662401 in words is "eighteen million, six hundred sixty-two thousand, four hundred one".