51447394 has 4 divisors (see below), whose sum is σ = 77171094. Its totient is φ = 25723696.

The previous prime is 51447391. The next prime is 51447437. The reversal of 51447394 is 49374415.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 33698025 + 17749369 = 5805^2 + 4213^2 .

It is not an unprimeable number, because it can be changed into a prime (51447391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12861847 + ... + 12861850.

Almost surely, 2^51447394 is an apocalyptic number.

51447394 is a deficient number, since it is larger than the sum of its proper divisors (25723700).

51447394 is a wasteful number, since it uses less digits than its factorization.

51447394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25723699.

The product of its digits is 60480, while the sum is 37.

The square root of 51447394 is about 7172.6838770435. The cubic root of 51447394 is about 371.9242195427.

The spelling of 51447394 in words is "fifty-one million, four hundred forty-seven thousand, three hundred ninety-four".