40388889 has 16 divisors (see below), whose sum is σ = 60022080. Its totient is φ = 24007680.

The previous prime is 40388857. The next prime is 40388891. The reversal of 40388889 is 98888304.

It is a happy number.

It is not a de Polignac number, because 40388889 - 2⁵ = 40388857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40388819) 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, 19872 + ... + 21809.

It is an arithmetic number, because the mean of its divisors is an integer number (3751380).

Almost surely, 2^40388889 is an apocalyptic number.

It is an amenable number.

40388889 is a deficient number, since it is larger than the sum of its proper divisors (19633191).

40388889 is a wasteful number, since it uses less digits than its factorization.

40388889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41720.

The product of its (nonzero) digits is 442368, while the sum is 48.

The square root of 40388889 is about 6355.2253303876. The cubic root of 40388889 is about 343.0999348979.

The spelling of 40388889 in words is "forty million, three hundred eighty-eight thousand, eight hundred eighty-nine".