51945438 has 48 divisors (see below), whose sum is σ = 114277680. Its totient is φ = 15719424.

The previous prime is 51945437. The next prime is 51945451. The reversal of 51945438 is 83454915.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51945396 and 51945405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51945433) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49770 + ... + 50802.

It is an arithmetic number, because the mean of its divisors is an integer number (2380785).

Almost surely, 2^51945438 is an apocalyptic number.

51945438 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

51945438 is an abundant number, since it is smaller than the sum of its proper divisors (62332242).

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

51945438 is a wasteful number, since it uses less digits than its factorization.

51945438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101 (or 1084 counting only the distinct ones).

The product of its digits is 86400, while the sum is 39.

The square root of 51945438 is about 7207.3183639964. The cubic root of 51945438 is about 373.1205230251.

The spelling of 51945438 in words is "fifty-one million, nine hundred forty-five thousand, four hundred thirty-eight".