51397838 has 4 divisors (see below), whose sum is σ = 77096760. Its totient is φ = 25698918.

The previous prime is 51397813. The next prime is 51397867. The reversal of 51397838 is 83879315.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12849458 + ... + 12849461.

It is an arithmetic number, because the mean of its divisors is an integer number (19274190).

Almost surely, 2^51397838 is an apocalyptic number.

51397838 is a deficient number, since it is larger than the sum of its proper divisors (25698922).

51397838 is a wasteful number, since it uses less digits than its factorization.

51397838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25698921.

The product of its digits is 181440, while the sum is 44.

The square root of 51397838 is about 7169.2285498511. The cubic root of 51397838 is about 371.8047642041.

The spelling of 51397838 in words is "fifty-one million, three hundred ninety-seven thousand, eight hundred thirty-eight".