18987495 has 32 divisors (see below), whose sum is σ = 31256064. Its totient is φ = 9840000.

The previous prime is 18987491. The next prime is 18987497. The reversal of 18987495 is 59478981.

It is not a de Polignac number, because 18987495 - 2² = 18987491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18987491) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125670 + ... + 125820.

It is an arithmetic number, because the mean of its divisors is an integer number (976752).

Almost surely, 2^18987495 is an apocalyptic number.

18987495 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18987495 is a deficient number, since it is larger than the sum of its proper divisors (12268569).

18987495 is a wasteful number, since it uses less digits than its factorization.

18987495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343.

The product of its digits is 725760, while the sum is 51.

The square root of 18987495 is about 4357.4642855679. The cubic root of 18987495 is about 266.7816110374.

The spelling of 18987495 in words is "eighteen million, nine hundred eighty-seven thousand, four hundred ninety-five".