394428749 has 8 divisors (see below), whose sum is σ = 463384992. Its totient is φ = 330989040.

The previous prime is 394428737. The next prime is 394428787. The reversal of 394428749 is 947824493.

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

It is a cyclic number.

It is not a de Polignac number, because 394428749 - 2²⁸ = 125993293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 394428697 and 394428706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394428719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1378979 + ... + 1379264.

It is an arithmetic number, because the mean of its divisors is an integer number (57923124).

Almost surely, 2^394428749 is an apocalyptic number.

It is an amenable number.

394428749 is a deficient number, since it is larger than the sum of its proper divisors (68956243).

394428749 is a wasteful number, since it uses less digits than its factorization.

394428749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2758267.

The product of its digits is 1741824, while the sum is 50.

The square root of 394428749 is about 19860.2303360258. The cubic root of 394428749 is about 733.3695166490.

The spelling of 394428749 in words is "three hundred ninety-four million, four hundred twenty-eight thousand, seven hundred forty-nine".