18897461 has 4 divisors (see below), whose sum is σ = 20615424. Its totient is φ = 17179500.

The previous prime is 18897449. The next prime is 18897469. The reversal of 18897461 is 16479881.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18897461 is a prime.

It is a super-2 number, since 2×18897461² = 714228064493042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18897469) 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, 858965 + ... + 858986.

It is an arithmetic number, because the mean of its divisors is an integer number (5153856).

Almost surely, 2^18897461 is an apocalyptic number.

18897461 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18897461 is a deficient number, since it is larger than the sum of its proper divisors (1717963).

18897461 is a wasteful number, since it uses less digits than its factorization.

18897461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1717962.

The product of its digits is 96768, while the sum is 44.

The square root of 18897461 is about 4347.1210013065. The cubic root of 18897461 is about 266.3592720084.

The spelling of 18897461 in words is "eighteen million, eight hundred ninety-seven thousand, four hundred sixty-one".