399433072891 has 2 divisors, whose sum is σ = 399433072892. Its totient is φ = 399433072890.

The previous prime is 399433072879. The next prime is 399433072949. The reversal of 399433072891 is 198270334993.

It is a happy number.

It is an a-pointer prime, because the next prime (399433072949) can be obtained adding 399433072891 to its sum of digits (58).

It is a weak prime.

It is an emirp because it is prime and its reverse (198270334993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399433072891 - 2¹³ = 399433064699 is a prime.

It is not a weakly prime, because it can be changed into another prime (399433073891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199716536445 + 199716536446.

It is an arithmetic number, because the mean of its divisors is an integer number (199716536446).

Almost surely, 2^399433072891 is an apocalyptic number.

399433072891 is a deficient number, since it is larger than the sum of its proper divisors (1).

399433072891 is an equidigital number, since it uses as much as digits as its factorization.

399433072891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8817984, while the sum is 58.

The spelling of 399433072891 in words is "three hundred ninety-nine billion, four hundred thirty-three million, seventy-two thousand, eight hundred ninety-one".