3640247 has 8 divisors (see below), whose sum is σ = 3958416. Its totient is φ = 3327552.

The previous prime is 3640243. The next prime is 3640249. The reversal of 3640247 is 7420463.

It is a happy number.

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 3640247 - 2² = 3640243 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640243) 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, 83 + ... + 2699.

It is an arithmetic number, because the mean of its divisors is an integer number (494802).

Almost surely, 2^3640247 is an apocalyptic number.

3640247 is a deficient number, since it is larger than the sum of its proper divisors (318169).

3640247 is a wasteful number, since it uses less digits than its factorization.

3640247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 3640247 is about 1907.9431333245. The cubic root of 3640247 is about 153.8309129710.

The spelling of 3640247 in words is "three million, six hundred forty thousand, two hundred forty-seven".