18394330 has 8 divisors (see below), whose sum is σ = 33109812. Its totient is φ = 7357728.

The previous prime is 18394309. The next prime is 18394331. The reversal of 18394330 is 3349381.

It can be written as a sum of positive squares in 2 ways, for example, as 17164449 + 1229881 = 4143^2 + 1109^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18394330² = 676702752297800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18394292 and 18394301.

It is not an unprimeable number, because it can be changed into a prime (18394331) 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, 919707 + ... + 919726.

Almost surely, 2^18394330 is an apocalyptic number.

18394330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18394330 is a deficient number, since it is larger than the sum of its proper divisors (14715482).

18394330 is a wasteful number, since it uses less digits than its factorization.

18394330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1839440.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 18394330 is about 4288.8611541993. The cubic root of 18394330 is about 263.9741040562.

The spelling of 18394330 in words is "eighteen million, three hundred ninety-four thousand, three hundred thirty".