549904393 has 4 divisors (see below), whose sum is σ = 549971968. Its totient is φ = 549836820.

The previous prime is 549904391. The next prime is 549904417. The reversal of 549904393 is 393409945.

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: 393409945 = 5 ⋅78681989.

It is a cyclic number.

It is not a de Polignac number, because 549904393 - 2¹ = 549904391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (549904391) 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, 19593 + ... + 38518.

It is an arithmetic number, because the mean of its divisors is an integer number (137492992).

Almost surely, 2^549904393 is an apocalyptic number.

It is an amenable number.

549904393 is a deficient number, since it is larger than the sum of its proper divisors (67575).

549904393 is an equidigital number, since it uses as much as digits as its factorization.

549904393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67574.

The product of its (nonzero) digits is 524880, while the sum is 46.

The square root of 549904393 is about 23450.0403624386. The cubic root of 549904393 is about 819.2737933958.

The spelling of 549904393 in words is "five hundred forty-nine million, nine hundred four thousand, three hundred ninety-three".