42738907 has 2 divisors, whose sum is σ = 42738908. Its totient is φ = 42738906.

The previous prime is 42738893. The next prime is 42738911. The reversal of 42738907 is 70983724.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42738907 is a prime.

It is a super-2 number, since 2×42738907² = 3653228343109298, which contains 22 as substring.

It is a Chen prime.

It is the 6538-th Hogben number.

It is equal to p_2589754 and since 42738907 and 2589754 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42738907.

It is not a weakly prime, because it can be changed into another prime (42738937) by changing a digit.

It is a nontrivial repunit in base 6537.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21369453 + 21369454.

It is an arithmetic number, because the mean of its divisors is an integer number (21369454).

Almost surely, 2^42738907 is an apocalyptic number.

42738907 is a deficient number, since it is larger than the sum of its proper divisors (1).

42738907 is an equidigital number, since it uses as much as digits as its factorization.

42738907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 42738907 is about 6537.5000573614. The cubic root of 42738907 is about 349.6292863971.

The spelling of 42738907 in words is "forty-two million, seven hundred thirty-eight thousand, nine hundred seven".