10309440 has 56 divisors (see below), whose sum is σ = 32735520. Its totient is φ = 2748928.

The previous prime is 10309433. The next prime is 10309447. The reversal of 10309440 is 4490301.

It is an interprime number because it is at equal distance from previous prime (10309433) and next prime (10309447).

It is a super-2 number, since 2×10309440² = 212569106227200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10309447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4410 + ... + 6329.

Almost surely, 2^10309440 is an apocalyptic number.

10309440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10309440 is an abundant number, since it is smaller than the sum of its proper divisors (22426080).

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

10309440 is a wasteful number, since it uses less digits than its factorization.

10309440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10759 (or 10749 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 10309440 is about 3210.8316679639. The cubic root of 10309440 is about 217.6431611327.

Adding to 10309440 its reverse (4490301), we get a palindrome (14799741).

The spelling of 10309440 in words is "ten million, three hundred nine thousand, four hundred forty".