18947892 has 24 divisors (see below), whose sum is σ = 44563456. Its totient is φ = 6265728.

The previous prime is 18947879. The next prime is 18947897. The reversal of 18947892 is 29874981.

It is a super-2 number, since 2×18947892² = 718045222487328, which contains 22 as substring.

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 (18947897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4693 + ... + 7740.

Almost surely, 2^18947892 is an apocalyptic number.

18947892 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18947892 is an abundant number, since it is smaller than the sum of its proper divisors (25615564).

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

18947892 is a wasteful number, since it uses less digits than its factorization.

18947892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12567 (or 12565 counting only the distinct ones).

The product of its digits is 290304, while the sum is 48.

The square root of 18947892 is about 4352.9176422257. The cubic root of 18947892 is about 266.5960028043.

The spelling of 18947892 in words is "eighteen million, nine hundred forty-seven thousand, eight hundred ninety-two".