51840007 has 2 divisors, whose sum is σ = 51840008. Its totient is φ = 51840006.

The previous prime is 51839971. The next prime is 51840043. The reversal of 51840007 is 70004815.

It is a balanced prime because it is at equal distance from previous prime (51839971) and next prime (51840043).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51840007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51840407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25920003 + 25920004.

It is an arithmetic number, because the mean of its divisors is an integer number (25920004).

Almost surely, 2^51840007 is an apocalyptic number.

51840007 is a deficient number, since it is larger than the sum of its proper divisors (1).

51840007 is an equidigital number, since it uses as much as digits as its factorization.

51840007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 51840007 is about 7200.0004861111. Note that the first 3 decimals coincide. The cubic root of 51840007 is about 372.8679174974.

The spelling of 51840007 in words is "fifty-one million, eight hundred forty thousand, seven".