393980493 has 8 divisors (see below), whose sum is σ = 525436288. Its totient is φ = 262589184.

The previous prime is 393980473. The next prime is 393980533. The reversal of 393980493 is 394089393.

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

It is not a de Polignac number, because 393980493 - 2¹³ = 393972301 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 (393980413) 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, 621 + ... + 28077.

It is an arithmetic number, because the mean of its divisors is an integer number (65679536).

Almost surely, 2^393980493 is an apocalyptic number.

It is an amenable number.

393980493 is a deficient number, since it is larger than the sum of its proper divisors (131455795).

393980493 is a wasteful number, since it uses less digits than its factorization.

393980493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32243.

The product of its (nonzero) digits is 629856, while the sum is 48.

The square root of 393980493 is about 19848.9418609658. The cubic root of 393980493 is about 733.0915941270.

Subtracting 393980493 from its reverse (394089393), we obtain a square (108900 = 330²).

The spelling of 393980493 in words is "three hundred ninety-three million, nine hundred eighty thousand, four hundred ninety-three".