10403840 has 60 divisors (see below), whose sum is σ = 25165056. Its totient is φ = 4128768.

The previous prime is 10403839. The next prime is 10403857. The reversal of 10403840 is 4830401.

It is a Harshad number since it is a multiple of its sum of digits (20).

10403840 is a Rhonda number in base 9.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81857 + ... + 81983.

Almost surely, 2^10403840 is an apocalyptic number.

10403840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10403840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12582528).

10403840 is an abundant number, since it is smaller than the sum of its proper divisors (14761216).

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

10403840 is an frugal number, since it uses more digits than its factorization.

10403840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 10403840 is about 3225.4984110987. The cubic root of 10403840 is about 218.3054383620.

The spelling of 10403840 in words is "ten million, four hundred three thousand, eight hundred forty".