393895649 has 4 divisors (see below), whose sum is σ = 450166464. Its totient is φ = 337624836.

The previous prime is 393895643. The next prime is 393895679. The reversal of 393895649 is 946598393.

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 393895649 - 2⁴ = 393895633 is a prime.

It is a super-3 number, since 3×393895649³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 393895594 and 393895603.

It is not an unprimeable number, because it can be changed into a prime (393895643) 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, 28135397 + ... + 28135410.

It is an arithmetic number, because the mean of its divisors is an integer number (112541616).

Almost surely, 2^393895649 is an apocalyptic number.

It is an amenable number.

393895649 is a deficient number, since it is larger than the sum of its proper divisors (56270815).

393895649 is an equidigital number, since it uses as much as digits as its factorization.

393895649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56270814.

The product of its digits is 6298560, while the sum is 56.

The square root of 393895649 is about 19846.8045034963. The cubic root of 393895649 is about 733.0389664042.

The spelling of 393895649 in words is "three hundred ninety-three million, eight hundred ninety-five thousand, six hundred forty-nine".