55398207 has 8 divisors (see below), whose sum is σ = 76411440. Its totient is φ = 35658560.

The previous prime is 55398199. The next prime is 55398221. The reversal of 55398207 is 70289355.

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

It is a cyclic number.

It is not a de Polignac number, because 55398207 - 2³ = 55398199 is a prime.

It is a super-2 number, since 2×55398207² = 6137922677629698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55398407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318294 + ... + 318467.

It is an arithmetic number, because the mean of its divisors is an integer number (9551430).

Almost surely, 2^55398207 is an apocalyptic number.

55398207 is a deficient number, since it is larger than the sum of its proper divisors (21013233).

55398207 is a wasteful number, since it uses less digits than its factorization.

55398207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636793.

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 55398207 is about 7442.9971785565. The cubic root of 55398207 is about 381.2108352853.

The spelling of 55398207 in words is "fifty-five million, three hundred ninety-eight thousand, two hundred seven".