399392743 has 2 divisors, whose sum is σ = 399392744. Its totient is φ = 399392742.

The previous prime is 399392663. The next prime is 399392753. The reversal of 399392743 is 347293993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 399392743 - 2¹³ = 399384551 is a prime.

It is a super-2 number, since 2×399392743² = 319029126322128098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399392753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199696371 + 199696372.

It is an arithmetic number, because the mean of its divisors is an integer number (199696372).

Almost surely, 2^399392743 is an apocalyptic number.

399392743 is a deficient number, since it is larger than the sum of its proper divisors (1).

399392743 is an equidigital number, since it uses as much as digits as its factorization.

399392743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 49.

The square root of 399392743 is about 19984.8128087305. The cubic root of 399392743 is about 736.4332518985.

The spelling of 399392743 in words is "three hundred ninety-nine million, three hundred ninety-two thousand, seven hundred forty-three".