3640402 has 4 divisors (see below), whose sum is σ = 5460606. Its totient is φ = 1820200.

The previous prime is 3640391. The next prime is 3640409. The reversal of 3640402 is 2040463.

3640402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2040463 = 151 ⋅13513.

It can be written as a sum of positive squares in only one way, i.e., 1874161 + 1766241 = 1369^2 + 1329^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3640402.

It is not an unprimeable number, because it can be changed into a prime (3640409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910099 + ... + 910102.

Almost surely, 2^3640402 is an apocalyptic number.

3640402 is a deficient number, since it is larger than the sum of its proper divisors (1820204).

3640402 is a wasteful number, since it uses less digits than its factorization.

3640402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820203.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 3640402 is about 1907.9837525514. The cubic root of 3640402 is about 153.8330962892.

Adding to 3640402 its reverse (2040463), we get a palindrome (5680865).

The spelling of 3640402 in words is "three million, six hundred forty thousand, four hundred two".