40489040 has 20 divisors (see below), whose sum is σ = 94137204. Its totient is φ = 16195584.

The previous prime is 40489027. The next prime is 40489049. The reversal of 40489040 is 4098404.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8317456 + 32171584 = 2884^2 + 5672^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 40488994 and 40489012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40489049) 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, 252977 + ... + 253136.

Almost surely, 2^40489040 is an apocalyptic number.

40489040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40489040 is an abundant number, since it is smaller than the sum of its proper divisors (53648164).

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

40489040 is a wasteful number, since it uses less digits than its factorization.

40489040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506126 (or 506120 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 40489040 is about 6363.0998734893. The cubic root of 40489040 is about 343.3832920253.

The spelling of 40489040 in words is "forty million, four hundred eighty-nine thousand, forty".