18887345 has 16 divisors (see below), whose sum is σ = 23265792. Its totient is φ = 14713920.

The previous prime is 18887333. The next prime is 18887371. The reversal of 18887345 is 54378881.

It is not a de Polignac number, because 18887345 - 2⁴ = 18887329 is a prime.

It is a super-2 number, since 2×18887345² = 713463602298050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18887296 and 18887305.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69560 + ... + 69830.

It is an arithmetic number, because the mean of its divisors is an integer number (1454112).

Almost surely, 2^18887345 is an apocalyptic number.

It is an amenable number.

18887345 is a deficient number, since it is larger than the sum of its proper divisors (4378447).

18887345 is a wasteful number, since it uses less digits than its factorization.

18887345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592.

The product of its digits is 215040, while the sum is 44.

The square root of 18887345 is about 4345.9573168636. The cubic root of 18887345 is about 266.3117352637.

The spelling of 18887345 in words is "eighteen million, eight hundred eighty-seven thousand, three hundred forty-five".