51423340 has 24 divisors (see below), whose sum is σ = 110909232. Its totient is φ = 20013120.

The previous prime is 51423319. The next prime is 51423341. The reversal of 51423340 is 4332415.

It is not an unprimeable number, because it can be changed into a prime (51423341) 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, 34006 + ... + 35485.

It is an arithmetic number, because the mean of its divisors is an integer number (4621218).

Almost surely, 2^51423340 is an apocalyptic number.

It is an amenable number.

51423340 is an abundant number, since it is smaller than the sum of its proper divisors (59485892).

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

51423340 is a wasteful number, since it uses less digits than its factorization.

51423340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69537 (or 69535 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 51423340 is about 7171.0069027996. The cubic root of 51423340 is about 371.8662466692.

Adding to 51423340 its reverse (4332415), we get a palindrome (55755755).

The spelling of 51423340 in words is "fifty-one million, four hundred twenty-three thousand, three hundred forty".