18287955 has 24 divisors (see below), whose sum is σ = 36228192. Its totient is φ = 8360064.

The previous prime is 18287933. The next prime is 18287957. The reversal of 18287955 is 55978281.

It is a happy number.

It is not a de Polignac number, because 18287955 - 2⁷ = 18287827 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 18287955.

It is not an unprimeable number, because it can be changed into a prime (18287957) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28714 + ... + 29343.

It is an arithmetic number, because the mean of its divisors is an integer number (1509508).

Almost surely, 2^18287955 is an apocalyptic number.

18287955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18287955 is a deficient number, since it is larger than the sum of its proper divisors (17940237).

18287955 is a wasteful number, since it uses less digits than its factorization.

18287955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58075 (or 58072 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The square root of 18287955 is about 4276.4418621092. The cubic root of 18287955 is about 263.4642630789.

The spelling of 18287955 in words is "eighteen million, two hundred eighty-seven thousand, nine hundred fifty-five".