18881772 has 48 divisors (see below), whose sum is σ = 54227712. Its totient is φ = 4979520.

The previous prime is 18881761. The next prime is 18881777. The reversal of 18881772 is 27718881.

It is a super-3 number, since 3×18881772³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (18881777) 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, 7554 + ... + 9737.

It is an arithmetic number, because the mean of its divisors is an integer number (1129744).

Almost surely, 2^18881772 is an apocalyptic number.

18881772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18881772 is an abundant number, since it is smaller than the sum of its proper divisors (35345940).

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

18881772 is a wasteful number, since it uses less digits than its factorization.

18881772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17318 (or 17316 counting only the distinct ones).

The product of its digits is 50176, while the sum is 42.

The square root of 18881772 is about 4345.3160989737. The cubic root of 18881772 is about 266.2855395703.

The spelling of 18881772 in words is "eighteen million, eight hundred eighty-one thousand, seven hundred seventy-two".