40394865 has 24 divisors (see below), whose sum is σ = 75185280. Its totient is φ = 18465888.

The previous prime is 40394863. The next prime is 40394899. The reversal of 40394865 is 56849304.

It is not a de Polignac number, because 40394865 - 2¹ = 40394863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40394863) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26745 + ... + 28214.

It is an arithmetic number, because the mean of its divisors is an integer number (3132720).

Almost surely, 2^40394865 is an apocalyptic number.

It is an amenable number.

40394865 is a deficient number, since it is larger than the sum of its proper divisors (34790415).

40394865 is a wasteful number, since it uses less digits than its factorization.

40394865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54981 (or 54974 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 40394865 is about 6355.6954772865. The cubic root of 40394865 is about 343.1168559220.

The spelling of 40394865 in words is "forty million, three hundred ninety-four thousand, eight hundred sixty-five".