18430155 has 24 divisors (see below), whose sum is σ = 32050512. Its totient is φ = 9797184.

The previous prime is 18430141. The next prime is 18430169. The reversal of 18430155 is 55103481.

It is an interprime number because it is at equal distance from previous prime (18430141) and next prime (18430169).

It is not a de Polignac number, because 18430155 - 2⁵ = 18430123 is a prime.

It is a super-2 number, since 2×18430155² = 679341226648050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20577 + ... + 21453.

It is an arithmetic number, because the mean of its divisors is an integer number (1335438).

Almost surely, 2^18430155 is an apocalyptic number.

18430155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18430155 is a deficient number, since it is larger than the sum of its proper divisors (13620357).

18430155 is a wasteful number, since it uses less digits than its factorization.

18430155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355 (or 1352 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 18430155 is about 4293.0356392651. The cubic root of 18430155 is about 264.1453658794.

The spelling of 18430155 in words is "eighteen million, four hundred thirty thousand, one hundred fifty-five".