18400634 has 16 divisors (see below), whose sum is σ = 31602048. Its totient is φ = 7871472.

The previous prime is 18400633. The next prime is 18400637. The reversal of 18400634 is 43600481.

It is not an unprimeable number, because it can be changed into a prime (18400631) 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, 10724 + ... + 12320.

It is an arithmetic number, because the mean of its divisors is an integer number (1975128).

Almost surely, 2^18400634 is an apocalyptic number.

18400634 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18400634 is a deficient number, since it is larger than the sum of its proper divisors (13201414).

18400634 is a wasteful number, since it uses less digits than its factorization.

18400634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2429.

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

The square root of 18400634 is about 4289.5960182749. The cubic root of 18400634 is about 264.0042565123.

The spelling of 18400634 in words is "eighteen million, four hundred thousand, six hundred thirty-four".