9400040 has 32 divisors (see below), whose sum is σ = 22778280. Its totient is φ = 3470592.

The previous prime is 9400021. The next prime is 9400043. The reversal of 9400040 is 400049.

It can be written as a sum of positive squares in 4 ways, for example, as 8305924 + 1094116 = 2882^2 + 1046^2 .

It is a junction number, because it is equal to n+sod(n) for n = 9399991 and 9400018.

It is not an unprimeable number, because it can be changed into a prime (9400043) 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, 8519 + ... + 9558.

Almost surely, 2^9400040 is an apocalyptic number.

It is an amenable number.

9400040 is an abundant number, since it is smaller than the sum of its proper divisors (13378240).

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

9400040 is a wasteful number, since it uses less digits than its factorization.

9400040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18101 (or 18097 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 9400040 is about 3065.9484666250. The cubic root of 9400040 is about 211.0457288038.

Adding to 9400040 its reverse (400049), we get a palindrome (9800089).

The spelling of 9400040 in words is "nine million, four hundred thousand, forty".