10391440 has 20 divisors (see below), whose sum is σ = 24160284. Its totient is φ = 4156544.

The previous prime is 10391419. The next prime is 10391441. The reversal of 10391440 is 4419301.

10391440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2027776 + 8363664 = 1424^2 + 2892^2 .

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

It is not an unprimeable number, because it can be changed into a prime (10391441) 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, 64867 + ... + 65026.

Almost surely, 2^10391440 is an apocalyptic number.

10391440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10391440 is an abundant number, since it is smaller than the sum of its proper divisors (13768844).

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

10391440 is a wasteful number, since it uses less digits than its factorization.

10391440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129906 (or 129900 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 10391440 is about 3223.5756544558. The cubic root of 10391440 is about 218.2186734879.

The spelling of 10391440 in words is "ten million, three hundred ninety-one thousand, four hundred forty".