10400639 has 2 divisors, whose sum is σ = 10400640. Its totient is φ = 10400638.

The previous prime is 10400603. The next prime is 10400641. The reversal of 10400639 is 93600401.

It is a strong prime.

It is an emirp because it is prime and its reverse (93600401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10400639 - 2¹² = 10396543 is a prime.

Together with 10400641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10400659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5200319 + 5200320.

It is an arithmetic number, because the mean of its divisors is an integer number (5200320).

Almost surely, 2^10400639 is an apocalyptic number.

10400639 is a deficient number, since it is larger than the sum of its proper divisors (1).

10400639 is an equidigital number, since it uses as much as digits as its factorization.

10400639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 10400639 is about 3225.0021705419. The cubic root of 10400639 is about 218.2830470338.

The spelling of 10400639 in words is "ten million, four hundred thousand, six hundred thirty-nine".