51403723 has 4 divisors (see below), whose sum is σ = 58747120. Its totient is φ = 44060328.

The previous prime is 51403687. The next prime is 51403739. The reversal of 51403723 is 32730415.

51403723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51403723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51403783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3671688 + ... + 3671701.

It is an arithmetic number, because the mean of its divisors is an integer number (14686780).

Almost surely, 2^51403723 is an apocalyptic number.

51403723 is a deficient number, since it is larger than the sum of its proper divisors (7343397).

51403723 is an equidigital number, since it uses as much as digits as its factorization.

51403723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7343396.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 51403723 is about 7169.6389727796. The cubic root of 51403723 is about 371.8189540845.

The spelling of 51403723 in words is "fifty-one million, four hundred three thousand, seven hundred twenty-three".