10400399 has 2 divisors, whose sum is σ = 10400400. Its totient is φ = 10400398.

The previous prime is 10400389. The next prime is 10400417. The reversal of 10400399 is 99300401.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10400399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10400309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5200199 + 5200200.

It is an arithmetic number, because the mean of its divisors is an integer number (5200200).

Almost surely, 2^10400399 is an apocalyptic number.

10400399 is a deficient number, since it is larger than the sum of its proper divisors (1).

10400399 is an equidigital number, since it uses as much as digits as its factorization.

10400399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 10400399 is about 3224.9649610500. The cubic root of 10400399 is about 218.2813680237.

The spelling of 10400399 in words is "ten million, four hundred thousand, three hundred ninety-nine".