399049425 has 72 divisors (see below), whose sum is σ = 771825600. Its totient is φ = 196479360.

The previous prime is 399049423. The next prime is 399049447. The reversal of 399049425 is 524940993.

It is a happy number.

It is not a de Polignac number, because 399049425 - 2¹ = 399049423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (399049421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 148746 + ... + 151404.

It is an arithmetic number, because the mean of its divisors is an integer number (10719800).

Almost surely, 2^399049425 is an apocalyptic number.

It is an amenable number.

399049425 is a deficient number, since it is larger than the sum of its proper divisors (372776175).

399049425 is a wasteful number, since it uses less digits than its factorization.

399049425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2727 (or 2719 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 399049425 is about 19976.2214895610. The cubic root of 399049425 is about 736.2221787341. Note that the first 3 decimals are identical.

The spelling of 399049425 in words is "three hundred ninety-nine million, forty-nine thousand, four hundred twenty-five".