399897434 has 8 divisors (see below), whose sum is σ = 602421300. Its totient is φ = 199090336.

The previous prime is 399897401. The next prime is 399897437. The reversal of 399897434 is 434798993.

It can be written as a sum of positive squares in 2 ways, for example, as 399000625 + 896809 = 19975^2 + 947^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 399897434.

It is not an unprimeable number, because it can be changed into a prime (399897437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 428609 + ... + 429540.

Almost surely, 2^399897434 is an apocalyptic number.

399897434 is a deficient number, since it is larger than the sum of its proper divisors (202523866).

399897434 is a wasteful number, since it uses less digits than its factorization.

399897434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858384.

The product of its digits is 5878656, while the sum is 56.

The square root of 399897434 is about 19997.4356856073. The cubic root of 399897434 is about 736.7433182822.

The spelling of 399897434 in words is "three hundred ninety-nine million, eight hundred ninety-seven thousand, four hundred thirty-four".