399546745 has 8 divisors (see below), whose sum is σ = 516337416. Its totient is φ = 295049856.

The previous prime is 399546703. The next prime is 399546751. The reversal of 399546745 is 547645993.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3059001 + 396487744 = 1749^2 + 19912^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 399546745 - 2⁷ = 399546617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399546692 and 399546701.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3073372 + ... + 3073501.

It is an arithmetic number, because the mean of its divisors is an integer number (64542177).

Almost surely, 2^399546745 is an apocalyptic number.

It is an amenable number.

399546745 is a deficient number, since it is larger than the sum of its proper divisors (116790671).

399546745 is a wasteful number, since it uses less digits than its factorization.

399546745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6146891.

The product of its digits is 4082400, while the sum is 52.

The square root of 399546745 is about 19988.6654131785. The cubic root of 399546745 is about 736.5278935946.

The spelling of 399546745 in words is "three hundred ninety-nine million, five hundred forty-six thousand, seven hundred forty-five".