55213398 has 24 divisors (see below), whose sum is σ = 122863728. Its totient is φ = 17906832.

The previous prime is 55213397. The next prime is 55213421. The reversal of 55213398 is 89331255.

55213398 is a `hidden beast` number, since 55 + 213 + 398 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55213393) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40786 + ... + 42117.

It is an arithmetic number, because the mean of its divisors is an integer number (5119322).

Almost surely, 2^55213398 is an apocalyptic number.

55213398 is an abundant number, since it is smaller than the sum of its proper divisors (67650330).

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

55213398 is a wasteful number, since it uses less digits than its factorization.

55213398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82948 (or 82945 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 55213398 is about 7430.5718487880. The cubic root of 55213398 is about 380.7864552402.

It can be divided in two parts, 55213 and 398, that added together give a triangular number (55611 = T₃₃₃).

The spelling of 55213398 in words is "fifty-five million, two hundred thirteen thousand, three hundred ninety-eight".