55143207 has 32 divisors (see below), whose sum is σ = 94914560. Its totient is φ = 30987360.

The previous prime is 55143197. The next prime is 55143227. The reversal of 55143207 is 70234155.

It is a happy number.

It is not a de Polignac number, because 55143207 - 2²³ = 46754599 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55143227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9138 + ... + 13920.

It is an arithmetic number, because the mean of its divisors is an integer number (2966080).

Almost surely, 2^55143207 is an apocalyptic number.

55143207 is a deficient number, since it is larger than the sum of its proper divisors (39771353).

55143207 is a wasteful number, since it uses less digits than its factorization.

55143207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4860 (or 4854 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 55143207 is about 7425.8472243913. The cubic root of 55143207 is about 380.6250263292.

The spelling of 55143207 in words is "fifty-five million, one hundred forty-three thousand, two hundred seven".