18897378 has 8 divisors (see below), whose sum is σ = 37794768. Its totient is φ = 6299124.

The previous prime is 18897341. The next prime is 18897391. The reversal of 18897378 is 87379881.

It is a sphenic number, since it is the product of 3 distinct primes.

18897378 is an admirable number.

It is a super-2 number, since 2×18897378² = 714221790549768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18897378.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1574776 + ... + 1574787.

It is an arithmetic number, because the mean of its divisors is an integer number (4724346).

Almost surely, 2^18897378 is an apocalyptic number.

18897378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18897378 is a wasteful number, since it uses less digits than its factorization.

18897378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3149568.

The product of its digits is 677376, while the sum is 51.

The square root of 18897378 is about 4347.1114547479. Note that the first 3 decimals coincide. The cubic root of 18897378 is about 266.3588820468.

The spelling of 18897378 in words is "eighteen million, eight hundred ninety-seven thousand, three hundred seventy-eight".