51998397 has 8 divisors (see below), whose sum is σ = 75634080. Its totient is φ = 31514160.

The previous prime is 51998389. The next prime is 51998399. The reversal of 51998397 is 79389915.

It is a happy number.

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

It is not a de Polignac number, because 51998397 - 2³ = 51998389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51998399) 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, 787822 + ... + 787887.

It is an arithmetic number, because the mean of its divisors is an integer number (9454260).

Almost surely, 2^51998397 is an apocalyptic number.

It is an amenable number.

51998397 is a deficient number, since it is larger than the sum of its proper divisors (23635683).

51998397 is a wasteful number, since it uses less digits than its factorization.

51998397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1575723.

The product of its digits is 612360, while the sum is 51.

The square root of 51998397 is about 7210.9914020196. The cubic root of 51998397 is about 373.2472802478.

The spelling of 51998397 in words is "fifty-one million, nine hundred ninety-eight thousand, three hundred ninety-seven".