51857398 has 16 divisors (see below), whose sum is σ = 80220096. Its totient is φ = 25126920.

The previous prime is 51857383. The next prime is 51857419. The reversal of 51857398 is 89375815.

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, 8965 + ... + 13567.

It is an arithmetic number, because the mean of its divisors is an integer number (5013756).

Almost surely, 2^51857398 is an apocalyptic number.

51857398 is a deficient number, since it is larger than the sum of its proper divisors (28362698).

51857398 is a wasteful number, since it uses less digits than its factorization.

51857398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4779.

The product of its digits is 302400, while the sum is 46.

The square root of 51857398 is about 7201.2080930910. The cubic root of 51857398 is about 372.9096087273.

It can be divided in two parts, 518573 and 98, that added together give a triangular number (518671 = T₁₀₁₈).

The spelling of 51857398 in words is "fifty-one million, eight hundred fifty-seven thousand, three hundred ninety-eight".