398833387 has 4 divisors (see below), whose sum is σ = 402363000. Its totient is φ = 395303776.

The previous prime is 398833381. The next prime is 398833423. The reversal of 398833387 is 783338893.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398833387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398833381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1764637 + ... + 1764862.

It is an arithmetic number, because the mean of its divisors is an integer number (100590750).

Almost surely, 2^398833387 is an apocalyptic number.

398833387 is a deficient number, since it is larger than the sum of its proper divisors (3529613).

398833387 is a wasteful number, since it uses less digits than its factorization.

398833387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3529612.

The product of its digits is 2612736, while the sum is 52.

The square root of 398833387 is about 19970.8133785282. The cubic root of 398833387 is about 736.0892957140.

The spelling of 398833387 in words is "three hundred ninety-eight million, eight hundred thirty-three thousand, three hundred eighty-seven".