398787747 has 8 divisors (see below), whose sum is σ = 535904256. Its totient is φ = 263764872.

The previous prime is 398787743. The next prime is 398787749. The reversal of 398787747 is 747787893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 398787747 - 2² = 398787743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398787743) 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 7 ways as a sum of consecutive naturals, for example, 522963 + ... + 523724.

It is an arithmetic number, because the mean of its divisors is an integer number (66988032).

Almost surely, 2^398787747 is an apocalyptic number.

398787747 is a deficient number, since it is larger than the sum of its proper divisors (137116509).

398787747 is a wasteful number, since it uses less digits than its factorization.

398787747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046817.

The product of its digits is 16595712, while the sum is 60.

The square root of 398787747 is about 19969.6706783061. The cubic root of 398787747 is about 736.0612168235.

The spelling of 398787747 in words is "three hundred ninety-eight million, seven hundred eighty-seven thousand, seven hundred forty-seven".