399662026873 has 4 divisors (see below), whose sum is σ = 399667760548. Its totient is φ = 399656293200.

The previous prime is 399662026867. The next prime is 399662026889. The reversal of 399662026873 is 378620266993.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 266388112384 + 133273914489 = 516128^2 + 365067^2 .

It is a cyclic number.

It is not a de Polignac number, because 399662026873 - 2¹³ = 399662018681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399662026843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2760978 + ... + 2902123.

It is an arithmetic number, because the mean of its divisors is an integer number (99916940137).

Almost surely, 2^399662026873 is an apocalyptic number.

It is an amenable number.

399662026873 is a deficient number, since it is larger than the sum of its proper divisors (5733675).

399662026873 is an equidigital number, since it uses as much as digits as its factorization.

399662026873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5733674.

The product of its (nonzero) digits is 35271936, while the sum is 61.

The spelling of 399662026873 in words is "three hundred ninety-nine billion, six hundred sixty-two million, twenty-six thousand, eight hundred seventy-three".