55438019 has 8 divisors (see below), whose sum is σ = 68231520. Its totient is φ = 43862976.

The previous prime is 55437997. The next prime is 55438039. The reversal of 55438019 is 91083455.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55438019 is a prime.

It is a super-2 number, since 2×55438019² = 6146747901288722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55438019.

It is not an unprimeable number, because it can be changed into a prime (55438039) 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, 304514 + ... + 304695.

It is an arithmetic number, because the mean of its divisors is an integer number (8528940).

Almost surely, 2^55438019 is an apocalyptic number.

55438019 is a deficient number, since it is larger than the sum of its proper divisors (12793501).

55438019 is a wasteful number, since it uses less digits than its factorization.

55438019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609229.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 55438019 is about 7445.6711584652. The cubic root of 55438019 is about 381.3021326542.

The spelling of 55438019 in words is "fifty-five million, four hundred thirty-eight thousand, nineteen".