40449864 has 64 divisors (see below), whose sum is σ = 124467840. Its totient is φ = 10667520.

The previous prime is 40449863. The next prime is 40449889. The reversal of 40449864 is 46894404.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (40449863) 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, 7077 + ... + 11444.

It is an arithmetic number, because the mean of its divisors is an integer number (1944810).

Almost surely, 2^40449864 is an apocalyptic number.

It is an amenable number.

40449864 is an abundant number, since it is smaller than the sum of its proper divisors (84017976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40449864 is a wasteful number, since it uses less digits than its factorization.

40449864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18550 (or 18546 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 39.

The square root of 40449864 is about 6360.0207546831. The cubic root of 40449864 is about 343.2725071076.

The spelling of 40449864 in words is "forty million, four hundred forty-nine thousand, eight hundred sixty-four".