2640395 has 8 divisors (see below), whose sum is σ = 3179904. Its totient is φ = 2104704.

The previous prime is 2640383. The next prime is 2640397. The reversal of 2640395 is 5930462.

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 2640395 - 2⁸ = 2640139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2640397) 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, 902 + ... + 2468.

It is an arithmetic number, because the mean of its divisors is an integer number (397488).

2^2640395 is an apocalyptic number.

2640395 is a deficient number, since it is larger than the sum of its proper divisors (539509).

2640395 is a wasteful number, since it uses less digits than its factorization.

2640395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1909.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 2640395 is about 1624.9292292282. The cubic root of 2640395 is about 138.2153572291.

The spelling of 2640395 in words is "two million, six hundred forty thousand, three hundred ninety-five".