51240186 has 12 divisors (see below), whose sum is σ = 111020442. Its totient is φ = 17080056.

The previous prime is 51240121. The next prime is 51240221. The reversal of 51240186 is 68104215.

It can be written as a sum of positive squares in only one way, i.e., 48566961 + 2673225 = 6969^2 + 1635^2 .

It is a super-2 number, since 2×51240186² = 5251113322629192, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1423321 + ... + 1423356.

Almost surely, 2^51240186 is an apocalyptic number.

51240186 is an abundant number, since it is smaller than the sum of its proper divisors (59780256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51240186 is a wasteful number, since it uses less digits than its factorization.

51240186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2846685 (or 2846682 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 51240186 is about 7158.2250593286. The cubic root of 51240186 is about 371.4242307044.

The spelling of 51240186 in words is "fifty-one million, two hundred forty thousand, one hundred eighty-six".