42697789 has 2 divisors, whose sum is σ = 42697790. Its totient is φ = 42697788.

The previous prime is 42697771. The next prime is 42697799. The reversal of 42697789 is 98779624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39275289 + 3422500 = 6267^2 + 1850^2 .

It is a cyclic number.

It is not a de Polignac number, because 42697789 - 2¹⁹ = 42173501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42697709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21348894 + 21348895.

It is an arithmetic number, because the mean of its divisors is an integer number (21348895).

Almost surely, 2^42697789 is an apocalyptic number.

It is an amenable number.

42697789 is a deficient number, since it is larger than the sum of its proper divisors (1).

42697789 is an equidigital number, since it uses as much as digits as its factorization.

42697789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 52.

The square root of 42697789 is about 6534.3545205322. The cubic root of 42697789 is about 349.5171273150.

The spelling of 42697789 in words is "forty-two million, six hundred ninety-seven thousand, seven hundred eighty-nine".