18740461 has 6 divisors (see below), whose sum is σ = 19365486. Its totient is φ = 18135000.

The previous prime is 18740453. The next prime is 18740473. The reversal of 18740461 is 16404781.

It can be written as a sum of positive squares in only one way, i.e., 16240900 + 2499561 = 4030^2 + 1581^2 .

It is not a de Polignac number, because 18740461 - 2³ = 18740453 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18740411) 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, 8790 + ... + 10711.

It is an arithmetic number, because the mean of its divisors is an integer number (3227581).

Almost surely, 2^18740461 is an apocalyptic number.

It is an amenable number.

18740461 is a deficient number, since it is larger than the sum of its proper divisors (625025).

18740461 is an equidigital number, since it uses as much as digits as its factorization.

18740461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19563 (or 19532 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 18740461 is about 4329.0254099508. The cubic root of 18740461 is about 265.6195826531.

The spelling of 18740461 in words is "eighteen million, seven hundred forty thousand, four hundred sixty-one".