40489640 has 16 divisors (see below), whose sum is σ = 91101780. Its totient is φ = 16195840.

The previous prime is 40489613. The next prime is 40489649. The reversal of 40489640 is 4698404.

It can be written as a sum of positive squares in 2 ways, for example, as 37871716 + 2617924 = 6154^2 + 1618^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 40489640.

It is not an unprimeable number, because it can be changed into a prime (40489649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506081 + ... + 506160.

Almost surely, 2^40489640 is an apocalyptic number.

40489640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40489640 is an abundant number, since it is smaller than the sum of its proper divisors (50612140).

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

40489640 is a wasteful number, since it uses less digits than its factorization.

40489640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012252 (or 1012248 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 40489640 is about 6363.1470201466. The cubic root of 40489640 is about 343.3849881959.

The spelling of 40489640 in words is "forty million, four hundred eighty-nine thousand, six hundred forty".