55998398 has 4 divisors (see below), whose sum is σ = 83997600. Its totient is φ = 27999198.

The previous prime is 55998389. The next prime is 55998409. The reversal of 55998398 is 89389955.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89389955 = 5 ⋅17877991.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13999598 + ... + 13999601.

It is an arithmetic number, because the mean of its divisors is an integer number (20999400).

Almost surely, 2^55998398 is an apocalyptic number.

55998398 is a deficient number, since it is larger than the sum of its proper divisors (27999202).

55998398 is a wasteful number, since it uses less digits than its factorization.

55998398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27999201.

The product of its digits is 3499200, while the sum is 56.

The square root of 55998398 is about 7483.2077346550. The cubic root of 55998398 is about 382.5825882866.

The spelling of 55998398 in words is "fifty-five million, nine hundred ninety-eight thousand, three hundred ninety-eight".