51947994 has 16 divisors (see below), whose sum is σ = 118738368. Its totient is φ = 14842272.

The previous prime is 51947977. The next prime is 51948011. The reversal of 51947994 is 49974915.

51947994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51947977) and next prime (51948011).

It is a super-4 number, since 4×51947994⁴ (a number of 32 digits) contains 4444 as substring.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 618387 + ... + 618470.

It is an arithmetic number, because the mean of its divisors is an integer number (7421148).

Almost surely, 2^51947994 is an apocalyptic number.

51947994 is an abundant number, since it is smaller than the sum of its proper divisors (66790374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51947994 is a wasteful number, since it uses less digits than its factorization.

51947994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236869.

The product of its digits is 408240, while the sum is 48.

The square root of 51947994 is about 7207.4956815804. The cubic root of 51947994 is about 373.1266427824.

The spelling of 51947994 in words is "fifty-one million, nine hundred forty-seven thousand, nine hundred ninety-four".