18947070 has 24 divisors (see below), whose sum is σ = 49262616. Its totient is φ = 5052528.

The previous prime is 18947069. The next prime is 18947087. The reversal of 18947070 is 7074981.

18947070 is a `hidden beast` number, since 189 + 470 + 7 + 0 = 666.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105172 + ... + 105351.

It is an arithmetic number, because the mean of its divisors is an integer number (2052609).

Almost surely, 2^18947070 is an apocalyptic number.

18947070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18947070 is an abundant number, since it is smaller than the sum of its proper divisors (30315546).

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

18947070 is a wasteful number, since it uses less digits than its factorization.

18947070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210536 (or 210533 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 18947070 is about 4352.8232217723. The cubic root of 18947070 is about 266.5921475806.

The spelling of 18947070 in words is "eighteen million, nine hundred forty-seven thousand, seventy".