18891552 has 48 divisors (see below), whose sum is σ = 49829472. Its totient is φ = 6266880.

The previous prime is 18891527. The next prime is 18891559. The reversal of 18891552 is 25519881.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 18891552.

It is not an unprimeable number, because it can be changed into a prime (18891559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29152 + ... + 29792.

It is an arithmetic number, because the mean of its divisors is an integer number (1038114).

Almost surely, 2^18891552 is an apocalyptic number.

18891552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18891552 is an abundant number, since it is smaller than the sum of its proper divisors (30937920).

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

18891552 is a wasteful number, since it uses less digits than its factorization.

18891552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961 (or 953 counting only the distinct ones).

The product of its digits is 28800, while the sum is 39.

The square root of 18891552 is about 4346.4413029512. The cubic root of 18891552 is about 266.3315067085.

The spelling of 18891552 in words is "eighteen million, eight hundred ninety-one thousand, five hundred fifty-two".