51840994 has 8 divisors (see below), whose sum is σ = 77827500. Its totient is φ = 25898496.

The previous prime is 51840991. The next prime is 51841001. The reversal of 51840994 is 49904815.

51840994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 50765625 + 1075369 = 7125^2 + 1037^2 .

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

It is not an unprimeable number, because it can be changed into a prime (51840991) 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, 7879 + ... + 12874.

Almost surely, 2^51840994 is an apocalyptic number.

51840994 is a deficient number, since it is larger than the sum of its proper divisors (25986506).

51840994 is a wasteful number, since it uses less digits than its factorization.

51840994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22004.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 51840994 is about 7200.0690274469. The cubic root of 51840994 is about 372.8702838698.

The spelling of 51840994 in words is "fifty-one million, eight hundred forty thousand, nine hundred ninety-four".