7500040 has 32 divisors (see below), whose sum is σ = 17057880. Its totient is φ = 2967552.

The previous prime is 7500029. The next prime is 7500049. The reversal of 7500040 is 400057.

It can be written as a sum of positive squares in 4 ways, for example, as 6380676 + 1119364 = 2526^2 + 1058^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7499987 and 7500023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7500049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2914 + ... + 4846.

Almost surely, 2^7500040 is an apocalyptic number.

It is an amenable number.

7500040 is an abundant number, since it is smaller than the sum of its proper divisors (9557840).

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

7500040 is a wasteful number, since it uses less digits than its factorization.

7500040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2041 (or 2037 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 16.

The square root of 7500040 is about 2738.6200904835. The cubic root of 7500040 is about 195.7437300461.

Adding to 7500040 its reverse (400057), we get a palindrome (7900097).

The spelling of 7500040 in words is "seven million, five hundred thousand, forty".