393999041 has 4 divisors (see below), whose sum is σ = 395453184. Its totient is φ = 392544900.

The previous prime is 393999019. The next prime is 393999043. The reversal of 393999041 is 140999393.

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, and also an emirpimes, since its reverse is a distinct semiprime: 140999393 = 1583 ⋅89071.

It is a cyclic number.

It is not a de Polignac number, because 393999041 - 2¹⁸ = 393736897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393999043) 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, 726665 + ... + 727206.

It is an arithmetic number, because the mean of its divisors is an integer number (98863296).

Almost surely, 2^393999041 is an apocalyptic number.

It is an amenable number.

393999041 is a deficient number, since it is larger than the sum of its proper divisors (1454143).

393999041 is a wasteful number, since it uses less digits than its factorization.

393999041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454142.

The product of its (nonzero) digits is 236196, while the sum is 47.

The square root of 393999041 is about 19849.4090844035. The cubic root of 393999041 is about 733.1030982241.

The spelling of 393999041 in words is "three hundred ninety-three million, nine hundred ninety-nine thousand, forty-one".