393631489 has 4 divisors (see below), whose sum is σ = 394821040. Its totient is φ = 392441940.

The previous prime is 393631487. The next prime is 393631501. The reversal of 393631489 is 984136393.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 393631489 - 2¹ = 393631487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393631487) 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, 594279 + ... + 594940.

It is an arithmetic number, because the mean of its divisors is an integer number (98705260).

Almost surely, 2^393631489 is an apocalyptic number.

It is an amenable number.

393631489 is a deficient number, since it is larger than the sum of its proper divisors (1189551).

393631489 is a wasteful number, since it uses less digits than its factorization.

393631489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189550.

The product of its digits is 419904, while the sum is 46.

The square root of 393631489 is about 19840.1484117433. The cubic root of 393631489 is about 732.8750626925.

The spelling of 393631489 in words is "three hundred ninety-three million, six hundred thirty-one thousand, four hundred eighty-nine".