51697938 has 8 divisors (see below), whose sum is σ = 103395888. Its totient is φ = 17232644.

The previous prime is 51697931. The next prime is 51697963. The reversal of 51697938 is 83979615.

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

51697938 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (51697931) 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, 4308156 + ... + 4308167.

It is an arithmetic number, because the mean of its divisors is an integer number (12924486).

Almost surely, 2^51697938 is an apocalyptic number.

51697938 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51697938 is a wasteful number, since it uses less digits than its factorization.

51697938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8616328.

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

The square root of 51697938 is about 7190.1278152756. The cubic root of 51697938 is about 372.5269875197.

The spelling of 51697938 in words is "fifty-one million, six hundred ninety-seven thousand, nine hundred thirty-eight".