10400391 has 12 divisors (see below), whose sum is σ = 15813720. Its totient is φ = 6568560.

The previous prime is 10400389. The next prime is 10400399. The reversal of 10400391 is 19300401.

10400391 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 10400391 - 2¹ = 10400389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10400399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30240 + ... + 30581.

It is an arithmetic number, because the mean of its divisors is an integer number (1317810).

Almost surely, 2^10400391 is an apocalyptic number.

10400391 is a deficient number, since it is larger than the sum of its proper divisors (5413329).

10400391 is a wasteful number, since it uses less digits than its factorization.

10400391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60846 (or 60843 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 10400391 is about 3224.9637207262. The cubic root of 10400391 is about 218.2813120563.

Adding to 10400391 its reverse (19300401), we get a palindrome (29700792).

The spelling of 10400391 in words is "ten million, four hundred thousand, three hundred ninety-one".