393686429 has 4 divisors (see below), whose sum is σ = 402062784. Its totient is φ = 385310076.

The previous prime is 393686413. The next prime is 393686471. The reversal of 393686429 is 924686393.

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 393686429 - 2⁴ = 393686413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393680429) 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, 4188107 + ... + 4188200.

It is an arithmetic number, because the mean of its divisors is an integer number (100515696).

Almost surely, 2^393686429 is an apocalyptic number.

It is an amenable number.

393686429 is a deficient number, since it is larger than the sum of its proper divisors (8376355).

393686429 is an equidigital number, since it uses as much as digits as its factorization.

393686429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8376354.

The product of its digits is 1679616, while the sum is 50.

The square root of 393686429 is about 19841.5329296907. The cubic root of 393686429 is about 732.9091574266.

The spelling of 393686429 in words is "three hundred ninety-three million, six hundred eighty-six thousand, four hundred twenty-nine".