51940397 has 4 divisors (see below), whose sum is σ = 52016256. Its totient is φ = 51864540.

The previous prime is 51940387. The next prime is 51940451. The reversal of 51940397 is 79304915.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51940397 - 2¹⁰ = 51939373 is a prime.

It is a super-3 number, since 3×51940397³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51940397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51940307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36893 + ... + 38274.

It is an arithmetic number, because the mean of its divisors is an integer number (13004064).

Almost surely, 2^51940397 is an apocalyptic number.

It is an amenable number.

51940397 is a deficient number, since it is larger than the sum of its proper divisors (75859).

51940397 is an equidigital number, since it uses as much as digits as its factorization.

51940397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75858.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 51940397 is about 7206.9686415302. The cubic root of 51940397 is about 373.1084529154.

The spelling of 51940397 in words is "fifty-one million, nine hundred forty thousand, three hundred ninety-seven".