18875690 has 8 divisors (see below), whose sum is σ = 33976260. Its totient is φ = 7550272.

The previous prime is 18875687. The next prime is 18875713. The reversal of 18875690 is 9657881.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17952169 + 923521 = 4237^2 + 961^2 .

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

It is a super-2 number, since 2×18875690² = 712583345952200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 943775 + ... + 943794.

Almost surely, 2^18875690 is an apocalyptic number.

18875690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18875690 is a deficient number, since it is larger than the sum of its proper divisors (15100570).

18875690 is a wasteful number, since it uses less digits than its factorization.

18875690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1887576.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 18875690 is about 4344.6162085966. The cubic root of 18875690 is about 266.2569454572.

The spelling of 18875690 in words is "eighteen million, eight hundred seventy-five thousand, six hundred ninety".