549851638 has 32 divisors (see below), whose sum is σ = 1018440000. Its totient is φ = 221784192.

The previous prime is 549851611. The next prime is 549851651. The reversal of 549851638 is 836158945.

It is a super-2 number, since 2×549851638² = 604673647622566088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a junction number, because it is equal to n+sod(n) for n = 549851591 and 549851600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11913 + ... + 35236.

It is an arithmetic number, because the mean of its divisors is an integer number (31826250).

Almost surely, 2^549851638 is an apocalyptic number.

549851638 is a deficient number, since it is larger than the sum of its proper divisors (468588362).

549851638 is a wasteful number, since it uses less digits than its factorization.

549851638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47189 (or 47175 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 49.

The square root of 549851638 is about 23448.9154973103. The cubic root of 549851638 is about 819.2475935862.

The spelling of 549851638 in words is "five hundred forty-nine million, eight hundred fifty-one thousand, six hundred thirty-eight".