18430397 has 6 divisors (see below), whose sum is σ = 19578618. Its totient is φ = 17345984.

The previous prime is 18430351. The next prime is 18430409. The reversal of 18430397 is 79303481.

It can be written as a sum of positive squares in 3 ways, for example, as 2859481 + 15570916 = 1691^2 + 3946^2 .

It is not a de Polignac number, because 18430397 - 2⁶ = 18430333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18430327) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31598 + ... + 32175.

It is an arithmetic number, because the mean of its divisors is an integer number (3263103).

Almost surely, 2^18430397 is an apocalyptic number.

18430397 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18430397 is a deficient number, since it is larger than the sum of its proper divisors (1148221).

18430397 is an equidigital number, since it uses as much as digits as its factorization.

18430397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63807 (or 63790 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 18430397 is about 4293.0638243567. The cubic root of 18430397 is about 264.1465220082.

The spelling of 18430397 in words is "eighteen million, four hundred thirty thousand, three hundred ninety-seven".