51949140 has 24 divisors (see below), whose sum is σ = 145457760. Its totient is φ = 13853088.

The previous prime is 51949133. The next prime is 51949141. The reversal of 51949140 is 4194915.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51949141) 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, 432850 + ... + 432969.

It is an arithmetic number, because the mean of its divisors is an integer number (6060740).

Almost surely, 2^51949140 is an apocalyptic number.

It is an amenable number.

51949140 is an abundant number, since it is smaller than the sum of its proper divisors (93508620).

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

51949140 is a wasteful number, since it uses less digits than its factorization.

51949140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865831 (or 865829 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 51949140 is about 7207.5751817099. The cubic root of 51949140 is about 373.1293865520.

The spelling of 51949140 in words is "fifty-one million, nine hundred forty-nine thousand, one hundred forty".