42091247 has 8 divisors (see below), whose sum is σ = 45964800. Its totient is φ = 38225560.

The previous prime is 42091207. The next prime is 42091277. The reversal of 42091247 is 74219024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42091247 - 2⁶ = 42091183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42091207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19004 + ... + 21102.

It is an arithmetic number, because the mean of its divisors is an integer number (5745600).

Almost surely, 2^42091247 is an apocalyptic number.

42091247 is a deficient number, since it is larger than the sum of its proper divisors (3873553).

42091247 is a wasteful number, since it uses less digits than its factorization.

42091247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3933.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 42091247 is about 6487.7767378355. The cubic root of 42091247 is about 347.8542101919.

The spelling of 42091247 in words is "forty-two million, ninety-one thousand, two hundred forty-seven".