51805942 has 4 divisors (see below), whose sum is σ = 77708916. Its totient is φ = 25902970.

The previous prime is 51805939. The next prime is 51805961. The reversal of 51805942 is 24950815.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 51805898 and 51805907.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 12951484 + ... + 12951487.

It is an arithmetic number, because the mean of its divisors is an integer number (19427229).

Almost surely, 2^51805942 is an apocalyptic number.

51805942 is a deficient number, since it is larger than the sum of its proper divisors (25902974).

51805942 is a wasteful number, since it uses less digits than its factorization.

51805942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25902973.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 51805942 is about 7197.6344725194. The cubic root of 51805942 is about 372.7862268653.

The spelling of 51805942 in words is "fifty-one million, eight hundred five thousand, nine hundred forty-two".