18884772 has 24 divisors (see below), whose sum is σ = 48960800. Its totient is φ = 6294888.

The previous prime is 18884759. The next prime is 18884791. The reversal of 18884772 is 27748881.

Added to its reverse (27748881) it gives a triangular number (46633653 = T₉₆₅₇).

It is a super-2 number, since 2×18884772² = 713269226983968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87322 + ... + 87537.

Almost surely, 2^18884772 is an apocalyptic number.

18884772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18884772 is an abundant number, since it is smaller than the sum of its proper divisors (30076028).

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

18884772 is a wasteful number, since it uses less digits than its factorization.

18884772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174872 (or 174864 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 18884772 is about 4345.6612845458. The cubic root of 18884772 is about 266.2996416068.

Adding to 18884772 its reverse (27748881), we get a triangular number (46633653 = T₉₆₅₇).

The spelling of 18884772 in words is "eighteen million, eight hundred eighty-four thousand, seven hundred seventy-two".