18461797 has 4 divisors (see below), whose sum is σ = 18496096. Its totient is φ = 18427500.

The previous prime is 18461789. The next prime is 18461809. The reversal of 18461797 is 79716481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79716481 = 13 ⋅6132037.

It is a cyclic number.

It is not a de Polignac number, because 18461797 - 2³ = 18461789 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 (18461717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16329 + ... + 17422.

It is an arithmetic number, because the mean of its divisors is an integer number (4624024).

Almost surely, 2^18461797 is an apocalyptic number.

It is an amenable number.

18461797 is a deficient number, since it is larger than the sum of its proper divisors (34299).

18461797 is an equidigital number, since it uses as much as digits as its factorization.

18461797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34298.

The product of its digits is 84672, while the sum is 43.

The square root of 18461797 is about 4296.7193299074. The cubic root of 18461797 is about 264.2964463415.

The spelling of 18461797 in words is "eighteen million, four hundred sixty-one thousand, seven hundred ninety-seven".