51689438 has 16 divisors (see below), whose sum is σ = 79634016. Its totient is φ = 25148160.

The previous prime is 51689423. The next prime is 51689461. The reversal of 51689438 is 83498615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48095 + ... + 49157.

It is an arithmetic number, because the mean of its divisors is an integer number (4977126).

Almost surely, 2^51689438 is an apocalyptic number.

51689438 is a deficient number, since it is larger than the sum of its proper divisors (27944578).

51689438 is a wasteful number, since it uses less digits than its factorization.

51689438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699.

The product of its digits is 207360, while the sum is 44.

The square root of 51689438 is about 7189.5367027368. The cubic root of 51689438 is about 372.5065698585.

The spelling of 51689438 in words is "fifty-one million, six hundred eighty-nine thousand, four hundred thirty-eight".