405013639 has 2 divisors, whose sum is σ = 405013640. Its totient is φ = 405013638.

The previous prime is 405013597. The next prime is 405013643. The reversal of 405013639 is 936310504.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 405013639 - 2¹⁷ = 404882567 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 405013639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405013669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202506819 + 202506820.

It is an arithmetic number, because the mean of its divisors is an integer number (202506820).

Almost surely, 2^405013639 is an apocalyptic number.

405013639 is a deficient number, since it is larger than the sum of its proper divisors (1).

405013639 is an equidigital number, since it uses as much as digits as its factorization.

405013639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 405013639 is about 20124.9506583246. The cubic root of 405013639 is about 739.8719275557.

It can be divided in two parts, 4050 and 13639, that added together give a square (17689 = 133²).

The spelling of 405013639 in words is "four hundred five million, thirteen thousand, six hundred thirty-nine".