18953136 has 80 divisors (see below), whose sum is σ = 55239520. Its totient is φ = 6220800.

The previous prime is 18953131. The next prime is 18953149. The reversal of 18953136 is 63135981.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18953136.

It is not an unprimeable number, because it can be changed into a prime (18953131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31236 + ... + 31836.

It is an arithmetic number, because the mean of its divisors is an integer number (690494).

Almost surely, 2^18953136 is an apocalyptic number.

18953136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18953136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27619760).

18953136 is an abundant number, since it is smaller than the sum of its proper divisors (36286384).

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

18953136 is a wasteful number, since it uses less digits than its factorization.

18953136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691 (or 679 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 18953136 is about 4353.5199551627. The cubic root of 18953136 is about 266.6205948184.

The spelling of 18953136 in words is "eighteen million, nine hundred fifty-three thousand, one hundred thirty-six".