18234378 has 24 divisors (see below), whose sum is σ = 40051908. Its totient is φ = 5994432.

The previous prime is 18234361. The next prime is 18234379. The reversal of 18234378 is 87343281.

It can be written as a sum of positive squares in 2 ways, for example, as 17363889 + 870489 = 4167^2 + 933^2 .

It is not an unprimeable number, because it can be changed into a prime (18234379) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5625 + ... + 8252.

Almost surely, 2^18234378 is an apocalyptic number.

18234378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18234378 is an abundant number, since it is smaller than the sum of its proper divisors (21817530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18234378 is a wasteful number, since it uses less digits than its factorization.

18234378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13958 (or 13955 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 18234378 is about 4270.1730644085. The cubic root of 18234378 is about 263.2067268693.

The spelling of 18234378 in words is "eighteen million, two hundred thirty-four thousand, three hundred seventy-eight".