3634981 has 4 divisors (see below), whose sum is σ = 4154272. Its totient is φ = 3115692.

The previous prime is 3634963. The next prime is 3634993. The reversal of 3634981 is 1894363.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1894363 = 37 ⋅51199.

It is a cyclic number.

It is not a de Polignac number, because 3634981 - 2⁵ = 3634949 is a prime.

It is a super-2 number, since 2×3634981² = 26426173740722, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3634901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259635 + ... + 259648.

It is an arithmetic number, because the mean of its divisors is an integer number (1038568).

Almost surely, 2^3634981 is an apocalyptic number.

It is an amenable number.

3634981 is a deficient number, since it is larger than the sum of its proper divisors (519291).

3634981 is an equidigital number, since it uses as much as digits as its factorization.

3634981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519290.

The product of its digits is 15552, while the sum is 34.

The square root of 3634981 is about 1906.5626137109. The cubic root of 3634981 is about 153.7566996442.

The spelling of 3634981 in words is "three million, six hundred thirty-four thousand, nine hundred eighty-one".