439090993657 has 2 divisors, whose sum is σ = 439090993658. Its totient is φ = 439090993656.

The previous prime is 439090993603. The next prime is 439090993787. The reversal of 439090993657 is 756399090934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 427178580921 + 11912412736 = 653589^2 + 109144^2 .

It is a cyclic number.

It is not a de Polignac number, because 439090993657 - 2¹⁹ = 439090469369 is a prime.

It is a super-2 number, since 2×439090993657² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (439090943657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219545496828 + 219545496829.

It is an arithmetic number, because the mean of its divisors is an integer number (219545496829).

Almost surely, 2^439090993657 is an apocalyptic number.

It is an amenable number.

439090993657 is a deficient number, since it is larger than the sum of its proper divisors (1).

439090993657 is an equidigital number, since it uses as much as digits as its factorization.

439090993657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49601160, while the sum is 64.

The spelling of 439090993657 in words is "four hundred thirty-nine billion, ninety million, nine hundred ninety-three thousand, six hundred fifty-seven".