399571145 has 8 divisors (see below), whose sum is σ = 507690504. Its totient is φ = 300853504.

The previous prime is 399571129. The next prime is 399571153. The reversal of 399571145 is 541175993.

It can be written as a sum of positive squares in 4 ways, for example, as 33269824 + 366301321 = 5768^2 + 19139^2 .

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 399571145 - 2⁴ = 399571129 is a prime.

It is a super-2 number, since 2×399571145² = 319314199833222050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399571096 and 399571105.

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, 2350334 + ... + 2350503.

It is an arithmetic number, because the mean of its divisors is an integer number (63461313).

Almost surely, 2^399571145 is an apocalyptic number.

It is an amenable number.

399571145 is a deficient number, since it is larger than the sum of its proper divisors (108119359).

399571145 is a wasteful number, since it uses less digits than its factorization.

399571145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4700859.

The product of its digits is 170100, while the sum is 44.

The square root of 399571145 is about 19989.2757497614. The cubic root of 399571145 is about 736.5428863458.

The spelling of 399571145 in words is "three hundred ninety-nine million, five hundred seventy-one thousand, one hundred forty-five".