40408989 has 16 divisors (see below), whose sum is σ = 54773184. Its totient is φ = 26496000.

The previous prime is 40408981. The next prime is 40408993. The reversal of 40408989 is 98980404.

It is not a de Polignac number, because 40408989 - 2³ = 40408981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40408989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40408981) 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, 58134 + ... + 58824.

It is an arithmetic number, because the mean of its divisors is an integer number (3423324).

Almost surely, 2^40408989 is an apocalyptic number.

It is an amenable number.

40408989 is a deficient number, since it is larger than the sum of its proper divisors (14364195).

40408989 is a wasteful number, since it uses less digits than its factorization.

40408989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 40408989 is about 6356.8065095612. The cubic root of 40408989 is about 343.1568413489.

The spelling of 40408989 in words is "forty million, four hundred eight thousand, nine hundred eighty-nine".