51201940 has 24 divisors (see below), whose sum is σ = 107785440. Its totient is φ = 20431008.

The previous prime is 51201923. The next prime is 51201947. The reversal of 51201940 is 4910215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51201947) 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, 5971 + ... + 11749.

It is an arithmetic number, because the mean of its divisors is an integer number (4491060).

Almost surely, 2^51201940 is an apocalyptic number.

It is an amenable number.

51201940 is an abundant number, since it is smaller than the sum of its proper divisors (56583500).

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

51201940 is a wasteful number, since it uses less digits than its factorization.

51201940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6231 (or 6229 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 51201940 is about 7155.5530883364. The cubic root of 51201940 is about 371.3317965685.

The spelling of 51201940 in words is "fifty-one million, two hundred one thousand, nine hundred forty".