18387898 has 8 divisors (see below), whose sum is σ = 28471680. Its totient is φ = 8897340.

The previous prime is 18387883. The next prime is 18387917. The reversal of 18387898 is 89878381.

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

It is a super-2 number, since 2×18387898² = 676229585716808, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

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, 148228 + ... + 148351.

It is an arithmetic number, because the mean of its divisors is an integer number (3558960).

Almost surely, 2^18387898 is an apocalyptic number.

18387898 is a deficient number, since it is larger than the sum of its proper divisors (10083782).

18387898 is a wasteful number, since it uses less digits than its factorization.

18387898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296612.

The product of its digits is 774144, while the sum is 52.

The square root of 18387898 is about 4288.1112392288. Note that the first 3 decimals coincide. The cubic root of 18387898 is about 263.9433322663.

The spelling of 18387898 in words is "eighteen million, three hundred eighty-seven thousand, eight hundred ninety-eight".