549917904 has 80 divisors (see below), whose sum is σ = 1509278400. Its totient is φ = 171939840.

The previous prime is 549917903. The next prime is 549917947. The reversal of 549917904 is 409719945.

It is a super-2 number, since 2×549917904² = 604819402279506432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549917903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283819 + ... + 285749.

It is an arithmetic number, because the mean of its divisors is an integer number (18865980).

Almost surely, 2^549917904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 549917904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (754639200).

549917904 is an abundant number, since it is smaller than the sum of its proper divisors (959360496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

549917904 is a wasteful number, since it uses less digits than its factorization.

549917904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2308 (or 2302 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 549917904 is about 23450.3284411967. The cubic root of 549917904 is about 819.2805031182.

The spelling of 549917904 in words is "five hundred forty-nine million, nine hundred seventeen thousand, nine hundred four".