40005385 has 16 divisors (see below), whose sum is σ = 55190016. Its totient is φ = 27269568.

The previous prime is 40005379. The next prime is 40005397. The reversal of 40005385 is 58350004.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 40005385 - 2³ = 40005377 is a prime.

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, 2752 + ... + 9358.

It is an arithmetic number, because the mean of its divisors is an integer number (3449376).

Almost surely, 2^40005385 is an apocalyptic number.

It is an amenable number.

40005385 is a deficient number, since it is larger than the sum of its proper divisors (15184631).

40005385 is a wasteful number, since it uses less digits than its factorization.

40005385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6792.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 40005385 is about 6324.9810276395. The cubic root of 40005385 is about 342.0105356808.

Adding to 40005385 its reverse (58350004), we get a palindrome (98355389).

The spelling of 40005385 in words is "forty million, five thousand, three hundred eighty-five".