399169061 has 8 divisors (see below), whose sum is σ = 434073240. Its totient is φ = 365534208.

The previous prime is 399169031. The next prime is 399169109. The reversal of 399169061 is 160961993.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 216648961 + 182520100 = 14719^2 + 13510^2 .

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 399169061 - 2¹⁰ = 399168037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399169031) 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, 316676 + ... + 317933.

It is an arithmetic number, because the mean of its divisors is an integer number (54259155).

Almost surely, 2^399169061 is an apocalyptic number.

It is an amenable number.

399169061 is a deficient number, since it is larger than the sum of its proper divisors (34904179).

399169061 is a wasteful number, since it uses less digits than its factorization.

399169061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634663.

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 399169061 is about 19979.2157253482. The cubic root of 399169061 is about 736.2957451234.

The spelling of 399169061 in words is "three hundred ninety-nine million, one hundred sixty-nine thousand, sixty-one".