18261801 has 8 divisors (see below), whose sum is σ = 27054560. Its totient is φ = 12174516.

The previous prime is 18261787. The next prime is 18261809. The reversal of 18261801 is 10816281.

It is not a de Polignac number, because 18261801 - 2⁷ = 18261673 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 676363 = 18261801 / (1 + 8 + 2 + 6 + 1 + 8 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18261809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338155 + ... + 338208.

It is an arithmetic number, because the mean of its divisors is an integer number (3381820).

Almost surely, 2^18261801 is an apocalyptic number.

It is an amenable number.

18261801 is a deficient number, since it is larger than the sum of its proper divisors (8792759).

18261801 is an equidigital number, since it uses as much as digits as its factorization.

18261801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676372 (or 676366 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 18261801 is about 4273.3828520272. The cubic root of 18261801 is about 263.3386078454.

The spelling of 18261801 in words is "eighteen million, two hundred sixty-one thousand, eight hundred one".