40389305 has 16 divisors (see below), whose sum is σ = 54165888. Its totient is φ = 28656000.

The previous prime is 40389301. The next prime is 40389313. The reversal of 40389305 is 50398304.

It is not a de Polignac number, because 40389305 - 2² = 40389301 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40389301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6701 + ... + 11210.

It is an arithmetic number, because the mean of its divisors is an integer number (3385368).

Almost surely, 2^40389305 is an apocalyptic number.

It is an amenable number.

40389305 is a deficient number, since it is larger than the sum of its proper divisors (13776583).

40389305 is a wasteful number, since it uses less digits than its factorization.

40389305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17968.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 40389305 is about 6355.2580592766. The cubic root of 40389305 is about 343.1011128545.

The spelling of 40389305 in words is "forty million, three hundred eighty-nine thousand, three hundred five".