3640431 has 16 divisors (see below), whose sum is σ = 5267808. Its totient is φ = 2227200.

The previous prime is 3640409. The next prime is 3640447. The reversal of 3640431 is 1340463.

It is not a de Polignac number, because 3640431 - 2⁹ = 3639919 is a prime.

It is a super-2 number, since 2×3640431² = 26505475731522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3640398 and 3640407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640451) 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, 1221 + ... + 2961.

It is an arithmetic number, because the mean of its divisors is an integer number (329238).

Almost surely, 2^3640431 is an apocalyptic number.

3640431 is a deficient number, since it is larger than the sum of its proper divisors (1627377).

3640431 is a wasteful number, since it uses less digits than its factorization.

3640431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1802.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 3640431 is about 1907.9913521817. The cubic root of 3640431 is about 153.8335047741.

Adding to 3640431 its reverse (1340463), we get a palindrome (4980894).

Subtracting from 3640431 its reverse (1340463), we obtain a cube (2299968 = 132³).

The spelling of 3640431 in words is "three million, six hundred forty thousand, four hundred thirty-one".