51440242 has 8 divisors (see below), whose sum is σ = 88183296. Its totient is φ = 22045812.

The previous prime is 51440237. The next prime is 51440251. The reversal of 51440242 is 24204415.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1837138 + ... + 1837165.

It is an arithmetic number, because the mean of its divisors is an integer number (11022912).

Almost surely, 2^51440242 is an apocalyptic number.

51440242 is a deficient number, since it is larger than the sum of its proper divisors (36743054).

51440242 is a wasteful number, since it uses less digits than its factorization.

51440242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3674312.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 51440242 is about 7172.1853015660. The cubic root of 51440242 is about 371.9069842979.

Adding to 51440242 its reverse (24204415), we get a palindrome (75644657).

The spelling of 51440242 in words is "fifty-one million, four hundred forty thousand, two hundred forty-two".