399137271749 has 2 divisors, whose sum is σ = 399137271750. Its totient is φ = 399137271748.

The previous prime is 399137271739. The next prime is 399137271763. The reversal of 399137271749 is 947172731993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 335638311649 + 63498960100 = 579343^2 + 251990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399137271749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399137271691 and 399137271700.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399137271739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199568635874 + 199568635875.

It is an arithmetic number, because the mean of its divisors is an integer number (199568635875).

Almost surely, 2^399137271749 is an apocalyptic number.

It is an amenable number.

399137271749 is a deficient number, since it is larger than the sum of its proper divisors (1).

399137271749 is an equidigital number, since it uses as much as digits as its factorization.

399137271749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18003384, while the sum is 62.

The spelling of 399137271749 in words is "three hundred ninety-nine billion, one hundred thirty-seven million, two hundred seventy-one thousand, seven hundred forty-nine".