18607021 has 2 divisors, whose sum is σ = 18607022. Its totient is φ = 18607020.

The previous prime is 18607019. The next prime is 18607031. The reversal of 18607021 is 12070681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13060996 + 5546025 = 3614^2 + 2355^2 .

It is a cyclic number.

It is not a de Polignac number, because 18607021 - 2¹ = 18607019 is a prime.

Together with 18607019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18607031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9303510 + 9303511.

It is an arithmetic number, because the mean of its divisors is an integer number (9303511).

Almost surely, 2^18607021 is an apocalyptic number.

It is an amenable number.

18607021 is a deficient number, since it is larger than the sum of its proper divisors (1).

18607021 is an equidigital number, since it uses as much as digits as its factorization.

18607021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 18607021 is about 4313.5856314672. The cubic root of 18607021 is about 264.9876391529.

The spelling of 18607021 in words is "eighteen million, six hundred seven thousand, twenty-one".