51438944 has 24 divisors (see below), whose sum is σ = 101719800. Its totient is φ = 25605376.

The previous prime is 51438943. The next prime is 51438949. The reversal of 51438944 is 44983415.

It is a junction number, because it is equal to n+sod(n) for n = 51438898 and 51438907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51438941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4007 + ... + 10905.

It is an arithmetic number, because the mean of its divisors is an integer number (4238325).

Almost surely, 2^51438944 is an apocalyptic number.

It is an amenable number.

51438944 is a deficient number, since it is larger than the sum of its proper divisors (50280856).

51438944 is a wasteful number, since it uses less digits than its factorization.

51438944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7142 (or 7134 counting only the distinct ones).

The product of its digits is 69120, while the sum is 38.

The square root of 51438944 is about 7172.0948125356. The cubic root of 51438944 is about 371.9038561418.

The spelling of 51438944 in words is "fifty-one million, four hundred thirty-eight thousand, nine hundred forty-four".