3618981 has 12 divisors (see below), whose sum is σ = 5455008. Its totient is φ = 2307624.

The previous prime is 3618961. The next prime is 3618991. The reversal of 3618981 is 1898163.

It is not a de Polignac number, because 3618981 - 2¹¹ = 3616933 is a prime.

It is a super-2 number, since 2×3618981² = 26194046956722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

3618981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3618961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8535 + ... + 8948.

It is an arithmetic number, because the mean of its divisors is an integer number (454584).

Almost surely, 2^3618981 is an apocalyptic number.

It is an amenable number.

3618981 is a deficient number, since it is larger than the sum of its proper divisors (1836027).

3618981 is a wasteful number, since it uses less digits than its factorization.

3618981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17512 (or 17509 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 3618981 is about 1902.3619529417. The cubic root of 3618981 is about 153.5307722297.

The spelling of 3618981 in words is "three million, six hundred eighteen thousand, nine hundred eighty-one".