18634870 has 16 divisors (see below), whose sum is σ = 33644160. Its totient is φ = 7431424.

The previous prime is 18634859. The next prime is 18634879. The reversal of 18634870 is 7843681.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18634879) 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, 891 + ... + 6169.

It is an arithmetic number, because the mean of its divisors is an integer number (2102760).

Almost surely, 2^18634870 is an apocalyptic number.

18634870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18634870 is a deficient number, since it is larger than the sum of its proper divisors (15009290).

18634870 is a wasteful number, since it uses less digits than its factorization.

18634870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5639.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 18634870 is about 4316.8124814497. The cubic root of 18634870 is about 265.1197749765.

The spelling of 18634870 in words is "eighteen million, six hundred thirty-four thousand, eight hundred seventy".