18123430 has 32 divisors (see below), whose sum is σ = 35481600. Its totient is φ = 6625152.

The previous prime is 18123421. The next prime is 18123431. The reversal of 18123430 is 3432181.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18123431) 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, 13531 + ... + 14809.

It is an arithmetic number, because the mean of its divisors is an integer number (1108800).

Almost surely, 2^18123430 is an apocalyptic number.

18123430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18123430 is a deficient number, since it is larger than the sum of its proper divisors (17358170).

18123430 is a wasteful number, since it uses less digits than its factorization.

18123430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 18123430 is about 4257.1622003396. The cubic root of 18123430 is about 262.6718089156.

The spelling of 18123430 in words is "eighteen million, one hundred twenty-three thousand, four hundred thirty".