51423444 has 24 divisors (see below), whose sum is σ = 133320320. Its totient is φ = 17141112.

The previous prime is 51423439. The next prime is 51423457. The reversal of 51423444 is 44432415.

It is a happy number.

It is a super-2 number, since 2×51423444² = 5288741185642272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237964 + ... + 238179.

Almost surely, 2^51423444 is an apocalyptic number.

51423444 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

51423444 is an abundant number, since it is smaller than the sum of its proper divisors (81896876).

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

51423444 is a wasteful number, since it uses less digits than its factorization.

51423444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476156 (or 476148 counting only the distinct ones).

The product of its digits is 7680, while the sum is 27.

The square root of 51423444 is about 7171.0141542184. The cubic root of 51423444 is about 371.8664973599.

Adding to 51423444 its reverse (44432415), we get a palindrome (95855859).

The spelling of 51423444 in words is "fifty-one million, four hundred twenty-three thousand, four hundred forty-four".