3640246447 has 4 divisors (see below), whose sum is σ = 3640997736. Its totient is φ = 3639495160.

The previous prime is 3640246439. The next prime is 3640246469. The reversal of 3640246447 is 7446420463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7446420463 = 409 ⋅18206407.

It is a cyclic number.

It is not a de Polignac number, because 3640246447 - 2³ = 3640246439 is a prime.

It is a super-2 number, since 2×3640246447² = 26502788389792247618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640241447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368329 + ... + 378082.

It is an arithmetic number, because the mean of its divisors is an integer number (910249434).

Almost surely, 2^3640246447 is an apocalyptic number.

3640246447 is a deficient number, since it is larger than the sum of its proper divisors (751289).

3640246447 is an equidigital number, since it uses as much as digits as its factorization.

3640246447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751288.

The product of its (nonzero) digits is 387072, while the sum is 40.

The square root of 3640246447 is about 60334.4548910488. The cubic root of 3640246447 is about 1538.3090518134.

The spelling of 3640246447 in words is "three billion, six hundred forty million, two hundred forty-six thousand, four hundred forty-seven".