3640999 has 2 divisors, whose sum is σ = 3641000. Its totient is φ = 3640998.

The previous prime is 3640993. The next prime is 3641041. The reversal of 3640999 is 9990463.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3640999 - 2³ = 3640991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3640991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1820499 + 1820500.

It is an arithmetic number, because the mean of its divisors is an integer number (1820500).

Almost surely, 2^3640999 is an apocalyptic number.

3640999 is a deficient number, since it is larger than the sum of its proper divisors (1).

3640999 is an equidigital number, since it uses as much as digits as its factorization.

3640999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 3640999 is about 1908.1401940109. The cubic root of 3640999 is about 153.8415050070.

The spelling of 3640999 in words is "three million, six hundred forty thousand, nine hundred ninety-nine".