42691658 has 24 divisors (see below), whose sum is σ = 68533452. Its totient is φ = 19940864.

The previous prime is 42691639. The next prime is 42691667. The reversal of 42691658 is 85619624.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 15578809 + 27112849 = 3947^2 + 5207^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134516 + ... + 134832.

Almost surely, 2^42691658 is an apocalyptic number.

42691658 is a deficient number, since it is larger than the sum of its proper divisors (25841794).

42691658 is a wasteful number, since it uses less digits than its factorization.

42691658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586 (or 569 counting only the distinct ones).

The product of its digits is 103680, while the sum is 41.

The square root of 42691658 is about 6533.8853678344. The cubic root of 42691658 is about 349.5003973926.

The spelling of 42691658 in words is "forty-two million, six hundred ninety-one thousand, six hundred fifty-eight".