42994087 has 2 divisors, whose sum is σ = 42994088. Its totient is φ = 42994086.

The previous prime is 42994073. The next prime is 42994129. The reversal of 42994087 is 78049924.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42994087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42994057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21497043 + 21497044.

It is an arithmetic number, because the mean of its divisors is an integer number (21497044).

Almost surely, 2^42994087 is an apocalyptic number.

42994087 is a deficient number, since it is larger than the sum of its proper divisors (1).

42994087 is an equidigital number, since it uses as much as digits as its factorization.

42994087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 42994087 is about 6556.9876467781. The cubic root of 42994087 is about 350.3237467035.

The spelling of 42994087 in words is "forty-two million, nine hundred ninety-four thousand, eighty-seven".