42991960439 has 4 divisors (see below), whose sum is σ = 43435176624. Its totient is φ = 42548744256.

The previous prime is 42991960393. The next prime is 42991960481. The reversal of 42991960439 is 93406919924.

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

It is a de Polignac number, because none of the positive numbers 2^k-42991960439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42991960139) 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, 221607947 + ... + 221608140.

It is an arithmetic number, because the mean of its divisors is an integer number (10858794156).

Almost surely, 2^42991960439 is an apocalyptic number.

42991960439 is a deficient number, since it is larger than the sum of its proper divisors (443216185).

42991960439 is an equidigital number, since it uses as much as digits as its factorization.

42991960439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443216184.

The product of its (nonzero) digits is 3779136, while the sum is 56.

The spelling of 42991960439 in words is "forty-two billion, nine hundred ninety-one million, nine hundred sixty thousand, four hundred thirty-nine".