394837491 has 8 divisors (see below), whose sum is σ = 526573504. Its totient is φ = 263163240.

The previous prime is 394837477. The next prime is 394837501. The reversal of 394837491 is 194738493.

It is a happy number.

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

It is not a de Polignac number, because 394837491 - 2¹⁷ = 394706419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 394837491.

It is not an unprimeable number, because it can be changed into a prime (394837441) 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, 2436 + ... + 28206.

It is an arithmetic number, because the mean of its divisors is an integer number (65821688).

Almost surely, 2^394837491 is an apocalyptic number.

394837491 is a deficient number, since it is larger than the sum of its proper divisors (131736013).

394837491 is a wasteful number, since it uses less digits than its factorization.

394837491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30881.

The product of its digits is 653184, while the sum is 48.

The square root of 394837491 is about 19870.5181361735. The cubic root of 394837491 is about 733.6227566725.

The spelling of 394837491 in words is "three hundred ninety-four million, eight hundred thirty-seven thousand, four hundred ninety-one".