18227961 has 24 divisors (see below), whose sum is σ = 28159560. Its totient is φ = 11321856.

The previous prime is 18227947. The next prime is 18227977. The reversal of 18227961 is 16972281.

It can be written as a sum of positive squares in 4 ways, for example, as 12467961 + 5760000 = 3531^2 + 2400^2 .

It is not a de Polignac number, because 18227961 - 2⁹ = 18227449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18227941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16131 + ... + 17223.

It is an arithmetic number, because the mean of its divisors is an integer number (1173315).

Almost surely, 2^18227961 is an apocalyptic number.

It is an amenable number.

18227961 is a deficient number, since it is larger than the sum of its proper divisors (9931599).

18227961 is a wasteful number, since it uses less digits than its factorization.

18227961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225 (or 1222 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 18227961 is about 4269.4216235926. The cubic root of 18227961 is about 263.1758475464.

The spelling of 18227961 in words is "eighteen million, two hundred twenty-seven thousand, nine hundred sixty-one".