40640385 has 8 divisors (see below), whose sum is σ = 65024640. Its totient is φ = 21674864.

The previous prime is 40640363. The next prime is 40640399. The reversal of 40640385 is 58304604.

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 40640385 - 2⁸ = 40640129 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1354665 + ... + 1354694.

It is an arithmetic number, because the mean of its divisors is an integer number (8128080).

Almost surely, 2^40640385 is an apocalyptic number.

It is an amenable number.

40640385 is a deficient number, since it is larger than the sum of its proper divisors (24384255).

40640385 is a wasteful number, since it uses less digits than its factorization.

40640385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2709367.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 40640385 is about 6374.9811764428. The cubic root of 40640385 is about 343.8106070547.

Adding to 40640385 its reverse (58304604), we get a palindrome (98944989).

The spelling of 40640385 in words is "forty million, six hundred forty thousand, three hundred eighty-five".