399951289 has 2 divisors, whose sum is σ = 399951290. Its totient is φ = 399951288.

The previous prime is 399951283. The next prime is 399951317. The reversal of 399951289 is 982159993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 330512400 + 69438889 = 18180^2 + 8333^2 .

It is an emirp because it is prime and its reverse (982159993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399951289 - 2³ = 399951281 is a prime.

It is a super-2 number, since 2×399951289² = 319922067145523042, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (399951281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199975644 + 199975645.

It is an arithmetic number, because the mean of its divisors is an integer number (199975645).

Almost surely, 2^399951289 is an apocalyptic number.

It is an amenable number.

399951289 is a deficient number, since it is larger than the sum of its proper divisors (1).

399951289 is an equidigital number, since it uses as much as digits as its factorization.

399951289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1574640, while the sum is 55.

The square root of 399951289 is about 19998.7821879233. The cubic root of 399951289 is about 736.7763897042.

The spelling of 399951289 in words is "three hundred ninety-nine million, nine hundred fifty-one thousand, two hundred eighty-nine".