51439416 has 192 divisors, whose sum is σ = 165473280. Its totient is φ = 13224960.

The previous prime is 51439411. The next prime is 51439439. The reversal of 51439416 is 61493415.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51439411) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 619711 + ... + 619793.

It is an arithmetic number, because the mean of its divisors is an integer number (861840).

Almost surely, 2^51439416 is an apocalyptic number.

51439416 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51439416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82736640).

51439416 is an abundant number, since it is smaller than the sum of its proper divisors (114033864).

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

51439416 is a wasteful number, since it uses less digits than its factorization.

51439416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 143 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 51439416 is about 7172.1277177697. The cubic root of 51439416 is about 371.9049936592.

The spelling of 51439416 in words is "fifty-one million, four hundred thirty-nine thousand, four hundred sixteen".