18400463 has 4 divisors (see below), whose sum is σ = 18450168. Its totient is φ = 18350760.

The previous prime is 18400451. The next prime is 18400489. The reversal of 18400463 is 36400481.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18400463 is a prime.

It is a super-2 number, since 2×18400463² = 677154077228738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18400423) 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, 24293 + ... + 25038.

It is an arithmetic number, because the mean of its divisors is an integer number (4612542).

Almost surely, 2^18400463 is an apocalyptic number.

18400463 is a deficient number, since it is larger than the sum of its proper divisors (49705).

18400463 is an equidigital number, since it uses as much as digits as its factorization.

18400463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49704.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 18400463 is about 4289.5760862817. The cubic root of 18400463 is about 264.0034386987.

The spelling of 18400463 in words is "eighteen million, four hundred thousand, four hundred sixty-three".