18987456 has 28 divisors (see below), whose sum is σ = 50238152. Its totient is φ = 6329088.

The previous prime is 18987391. The next prime is 18987457. The reversal of 18987456 is 65478981.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18987457) 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, 49255 + ... + 49638.

Almost surely, 2^18987456 is an apocalyptic number.

18987456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18987456 is an abundant number, since it is smaller than the sum of its proper divisors (31250696).

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

18987456 is an equidigital number, since it uses as much as digits as its factorization.

18987456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98908 (or 98898 counting only the distinct ones).

The product of its digits is 483840, while the sum is 48.

The square root of 18987456 is about 4357.4598104859. The cubic root of 18987456 is about 266.7814283823.

The spelling of 18987456 in words is "eighteen million, nine hundred eighty-seven thousand, four hundred fifty-six".