3640281 has 4 divisors (see below), whose sum is σ = 4853712. Its totient is φ = 2426852.

The previous prime is 3640249. The next prime is 3640289. The reversal of 3640281 is 1820463.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 3640281 - 2⁵ = 3640249 is a prime.

It is a super-2 number, since 2×3640281² = 26503291517922, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3640289) 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, 606711 + ... + 606716.

It is an arithmetic number, because the mean of its divisors is an integer number (1213428).

Almost surely, 2^3640281 is an apocalyptic number.

It is an amenable number.

3640281 is a deficient number, since it is larger than the sum of its proper divisors (1213431).

3640281 is a wasteful number, since it uses less digits than its factorization.

3640281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213430.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 3640281 is about 1907.9520434225. The cubic root of 3640281 is about 153.8313918977.

The spelling of 3640281 in words is "three million, six hundred forty thousand, two hundred eighty-one".