51689942 has 16 divisors (see below), whose sum is σ = 80015040. Its totient is φ = 25029888.

The previous prime is 51689941. The next prime is 51689969. The reversal of 51689942 is 24998615.

It is a super-3 number, since 3×51689942³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51689893 and 51689902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51689941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6284 + ... + 11952.

It is an arithmetic number, because the mean of its divisors is an integer number (5000940).

Almost surely, 2^51689942 is an apocalyptic number.

51689942 is a deficient number, since it is larger than the sum of its proper divisors (28325098).

51689942 is a wasteful number, since it uses less digits than its factorization.

51689942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5815.

The product of its digits is 155520, while the sum is 44.

The square root of 51689942 is about 7189.5717535887. The cubic root of 51689942 is about 372.5077805681.

The spelling of 51689942 in words is "fifty-one million, six hundred eighty-nine thousand, nine hundred forty-two".