3640407 has 4 divisors (see below), whose sum is σ = 4853880. Its totient is φ = 2426936.

The previous prime is 3640391. The next prime is 3640409. The reversal of 3640407 is 7040463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7040463 = 3 ⋅2346821.

It is a cyclic number.

It is not a de Polignac number, because 3640407 - 2⁴ = 3640391 is a prime.

It is a D-number.

It is a congruent number.

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606732 + ... + 606737.

It is an arithmetic number, because the mean of its divisors is an integer number (1213470).

Almost surely, 2^3640407 is an apocalyptic number.

3640407 is a deficient number, since it is larger than the sum of its proper divisors (1213473).

3640407 is a wasteful number, since it uses less digits than its factorization.

3640407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213472.

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 3640407 is about 1907.9850628346. The cubic root of 3640407 is about 153.8331667178.

The spelling of 3640407 in words is "three million, six hundred forty thousand, four hundred seven".