42620939 has 4 divisors (see below), whose sum is σ = 43995840. Its totient is φ = 41246040.

The previous prime is 42620917. The next prime is 42620959. The reversal of 42620939 is 93902624.

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

It is a cyclic number.

It is not a de Polignac number, because 42620939 - 2¹² = 42616843 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42620899 and 42620908.

It is not an unprimeable number, because it can be changed into a prime (42620959) 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, 687404 + ... + 687465.

It is an arithmetic number, because the mean of its divisors is an integer number (10998960).

Almost surely, 2^42620939 is an apocalyptic number.

42620939 is a deficient number, since it is larger than the sum of its proper divisors (1374901).

42620939 is a wasteful number, since it uses less digits than its factorization.

42620939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374900.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 42620939 is about 6528.4714137384. The cubic root of 42620939 is about 349.3073075330.

The spelling of 42620939 in words is "forty-two million, six hundred twenty thousand, nine hundred thirty-nine".