52781439 has 8 divisors (see below), whose sum is σ = 70709632. Its totient is φ = 35020440.

The previous prime is 52781419. The next prime is 52781543. The reversal of 52781439 is 93418725.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 52781439 - 2¹² = 52777343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 52781397 and 52781406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52781419) 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, 41059 + ... + 42324.

It is an arithmetic number, because the mean of its divisors is an integer number (8838704).

Almost surely, 2^52781439 is an apocalyptic number.

52781439 is a deficient number, since it is larger than the sum of its proper divisors (17928193).

52781439 is a wasteful number, since it uses less digits than its factorization.

52781439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83597.

The product of its digits is 60480, while the sum is 39.

The square root of 52781439 is about 7265.0835507928. The cubic root of 52781439 is about 375.1115259397. Note that the first 3 decimals are identical.

The spelling of 52781439 in words is "fifty-two million, seven hundred eighty-one thousand, four hundred thirty-nine".