399062521 has 8 divisors (see below), whose sum is σ = 468828864. Its totient is φ = 334877520.

The previous prime is 399062509. The next prime is 399062569. The reversal of 399062521 is 125260993.

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 399062521 - 2¹³ = 399054329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399062621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1395181 + ... + 1395466.

It is an arithmetic number, because the mean of its divisors is an integer number (58603608).

Almost surely, 2^399062521 is an apocalyptic number.

It is an amenable number.

399062521 is a deficient number, since it is larger than the sum of its proper divisors (69766343).

399062521 is a wasteful number, since it uses less digits than its factorization.

399062521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2790671.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 399062521 is about 19976.5492765893. The cubic root of 399062521 is about 736.2302324234.

The spelling of 399062521 in words is "three hundred ninety-nine million, sixty-two thousand, five hundred twenty-one".