51782397 has 8 divisors (see below), whose sum is σ = 69727200. Its totient is φ = 34179600.

The previous prime is 51782389. The next prime is 51782411. The reversal of 51782397 is 79328715.

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

It is not a de Polignac number, because 51782397 - 2³ = 51782389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51782317) 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, 85147 + ... + 85752.

It is an arithmetic number, because the mean of its divisors is an integer number (8715900).

Almost surely, 2^51782397 is an apocalyptic number.

It is an amenable number.

51782397 is a deficient number, since it is larger than the sum of its proper divisors (17944803).

51782397 is a wasteful number, since it uses less digits than its factorization.

51782397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171003.

The product of its digits is 105840, while the sum is 42.

The square root of 51782397 is about 7195.9986798220. The cubic root of 51782397 is about 372.7297431145.

The spelling of 51782397 in words is "fifty-one million, seven hundred eighty-two thousand, three hundred ninety-seven".