398564429 has 4 divisors (see below), whose sum is σ = 412308060. Its totient is φ = 384820800.

The previous prime is 398564363. The next prime is 398564437. The reversal of 398564429 is 924465893.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 196981225 + 201583204 = 14035^2 + 14198^2 .

It is a cyclic number.

It is not a de Polignac number, because 398564429 - 2¹² = 398560333 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398564459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6871772 + ... + 6871829.

It is an arithmetic number, because the mean of its divisors is an integer number (103077015).

Almost surely, 2^398564429 is an apocalyptic number.

It is an amenable number.

398564429 is a deficient number, since it is larger than the sum of its proper divisors (13743631).

398564429 is a wasteful number, since it uses less digits than its factorization.

398564429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13743630.

The product of its digits is 1866240, while the sum is 50.

The square root of 398564429 is about 19964.0784660850. The cubic root of 398564429 is about 735.9237950057.

The spelling of 398564429 in words is "three hundred ninety-eight million, five hundred sixty-four thousand, four hundred twenty-nine".