399061581 has 16 divisors (see below), whose sum is σ = 547441344. Its totient is φ = 258470784.

The previous prime is 399061561. The next prime is 399061609. The reversal of 399061581 is 185160993.

It is not a de Polignac number, because 399061581 - 2¹⁵ = 399028813 is a prime.

It is a super-2 number, since 2×399061581² = 318500290860439122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399061511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1075 + ... + 28271.

It is an arithmetic number, because the mean of its divisors is an integer number (34215084).

Almost surely, 2^399061581 is an apocalyptic number.

It is an amenable number.

399061581 is a deficient number, since it is larger than the sum of its proper divisors (148379763).

399061581 is a wasteful number, since it uses less digits than its factorization.

399061581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27340.

The product of its (nonzero) digits is 58320, while the sum is 42.

The square root of 399061581 is about 19976.5257489885. The cubic root of 399061581 is about 736.2296543544.

The spelling of 399061581 in words is "three hundred ninety-nine million, sixty-one thousand, five hundred eighty-one".