3640385 has 16 divisors (see below), whose sum is σ = 5101056. Its totient is φ = 2442048.

The previous prime is 3640379. The next prime is 3640391. The reversal of 3640385 is 5830463.

It is an interprime number because it is at equal distance from previous prime (3640379) and next prime (3640391).

It is not a de Polignac number, because 3640385 - 2⁴ = 3640369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 539 + ... + 2751.

It is an arithmetic number, because the mean of its divisors is an integer number (318816).

Almost surely, 2^3640385 is an apocalyptic number.

3640385 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3640385 is a deficient number, since it is larger than the sum of its proper divisors (1460671).

3640385 is a wasteful number, since it uses less digits than its factorization.

3640385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2272.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 3640385 is about 1907.9792975816. The cubic root of 3640385 is about 153.8328568315.

The spelling of 3640385 in words is "three million, six hundred forty thousand, three hundred eighty-five".