399451487 has 4 divisors (see below), whose sum is σ = 399810216. Its totient is φ = 399092760.

The previous prime is 399451477. The next prime is 399451583. The reversal of 399451487 is 784154993.

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

It is a cyclic number.

It is not a de Polignac number, because 399451487 - 2⁴ = 399451471 is a prime.

It is a super-2 number, since 2×399451487² = 319122980933022338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399451447) 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, 177689 + ... + 179922.

It is an arithmetic number, because the mean of its divisors is an integer number (99952554).

Almost surely, 2^399451487 is an apocalyptic number.

399451487 is a deficient number, since it is larger than the sum of its proper divisors (358729).

399451487 is a wasteful number, since it uses less digits than its factorization.

399451487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358728.

The product of its digits is 1088640, while the sum is 50.

The square root of 399451487 is about 19986.2824707348. The cubic root of 399451487 is about 736.4693558044.

The spelling of 399451487 in words is "three hundred ninety-nine million, four hundred fifty-one thousand, four hundred eighty-seven".