3640494 has 32 divisors (see below), whose sum is σ = 8555904. Its totient is φ = 1018080.

The previous prime is 3640493. The next prime is 3640519. The reversal of 3640494 is 4940463.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1264 + ... + 2979.

It is an arithmetic number, because the mean of its divisors is an integer number (267372).

Almost surely, 2^3640494 is an apocalyptic number.

3640494 is an abundant number, since it is smaller than the sum of its proper divisors (4915410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3640494 is a wasteful number, since it uses less digits than its factorization.

3640494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4272.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 3640494 is about 1908.0078616190. The cubic root of 3640494 is about 153.8343921649.

Subtracting from 3640494 its sum of digits (30), we obtain a square (3640464 = 1908²).

The spelling of 3640494 in words is "three million, six hundred forty thousand, four hundred ninety-four".