3640279 has 8 divisors (see below), whose sum is σ = 3825792. Its totient is φ = 3457080.

The previous prime is 3640249. The next prime is 3640289. The reversal of 3640279 is 9720463.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3640279 - 2⁷ = 3640151 is a prime.

It is an Ulam number.

It is a Duffinian number.

3640279 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3640279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3264 + ... + 4234.

It is an arithmetic number, because the mean of its divisors is an integer number (478224).

Almost surely, 2^3640279 is an apocalyptic number.

3640279 is a deficient number, since it is larger than the sum of its proper divisors (185513).

3640279 is a wasteful number, since it uses less digits than its factorization.

3640279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 3640279 is about 1907.9515193002. The cubic root of 3640279 is about 153.8313637256.

It can be divided in two parts, 36402 and 79, that added together give a square (36481 = 191²).

The spelling of 3640279 in words is "three million, six hundred forty thousand, two hundred seventy-nine".