42444739 has 2 divisors, whose sum is σ = 42444740. Its totient is φ = 42444738.

The previous prime is 42444737. The next prime is 42444751. The reversal of 42444739 is 93744424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42444739 - 2¹ = 42444737 is a prime.

Together with 42444737, it forms a pair of twin primes.

It is a nialpdrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 42444698 and 42444707.

It is not a weakly prime, because it can be changed into another prime (42444737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21222369 + 21222370.

It is an arithmetic number, because the mean of its divisors is an integer number (21222370).

Almost surely, 2^42444739 is an apocalyptic number.

42444739 is a deficient number, since it is larger than the sum of its proper divisors (1).

42444739 is an equidigital number, since it uses as much as digits as its factorization.

42444739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 37.

The square root of 42444739 is about 6514.9627013514. The cubic root of 42444739 is about 348.8252834398.

The spelling of 42444739 in words is "forty-two million, four hundred forty-four thousand, seven hundred thirty-nine".