398409739 has 24 divisors (see below), whose sum is σ = 528480288. Its totient is φ = 296674560.

The previous prime is 398409733. The next prime is 398409757. The reversal of 398409739 is 937904893.

It is not a de Polignac number, because 398409739 - 2¹⁷ = 398278667 is a prime.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398409733) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7567 + ... + 29224.

It is an arithmetic number, because the mean of its divisors is an integer number (22020012).

Almost surely, 2^398409739 is an apocalyptic number.

398409739 is a deficient number, since it is larger than the sum of its proper divisors (130070549).

398409739 is a wasteful number, since it uses less digits than its factorization.

398409739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36835 (or 36828 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 52.

The square root of 398409739 is about 19960.2038817243. The cubic root of 398409739 is about 735.8285742797.

The spelling of 398409739 in words is "three hundred ninety-eight million, four hundred nine thousand, seven hundred thirty-nine".