18681901 has 16 divisors (see below), whose sum is σ = 21841920. Its totient is φ = 15649920.

The previous prime is 18681899. The next prime is 18681907. The reversal of 18681901 is 10918681.

It is a cyclic number.

It is not a de Polignac number, because 18681901 - 2¹ = 18681899 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 (18681907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97716 + ... + 97906.

It is an arithmetic number, because the mean of its divisors is an integer number (1365120).

Almost surely, 2^18681901 is an apocalyptic number.

It is an amenable number.

18681901 is a deficient number, since it is larger than the sum of its proper divisors (3160019).

18681901 is a wasteful number, since it uses less digits than its factorization.

18681901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444.

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 18681901 is about 4322.2564708726. The cubic root of 18681901 is about 265.3426255272.

The spelling of 18681901 in words is "eighteen million, six hundred eighty-one thousand, nine hundred one".