61983439 has 4 divisors (see below), whose sum is σ = 70838224. Its totient is φ = 53128656.

The previous prime is 61983437. The next prime is 61983457. The reversal of 61983439 is 93438916.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61983439 - 2¹ = 61983437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61983395 and 61983404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61983433) 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, 4427382 + ... + 4427395.

It is an arithmetic number, because the mean of its divisors is an integer number (17709556).

Almost surely, 2^61983439 is an apocalyptic number.

61983439 is a deficient number, since it is larger than the sum of its proper divisors (8854785).

61983439 is an equidigital number, since it uses as much as digits as its factorization.

61983439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8854784.

The product of its digits is 139968, while the sum is 43.

The square root of 61983439 is about 7872.9561792252. The cubic root of 61983439 is about 395.7539176993.

The spelling of 61983439 in words is "sixty-one million, nine hundred eighty-three thousand, four hundred thirty-nine".