42891447 has 8 divisors (see below), whose sum is σ = 57460480. Its totient is φ = 28458360.

The previous prime is 42891427. The next prime is 42891461. The reversal of 42891447 is 74419824.

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

It is not a de Polignac number, because 42891447 - 2²² = 38697143 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 (42891427) 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, 33247 + ... + 34512.

It is an arithmetic number, because the mean of its divisors is an integer number (7182560).

Almost surely, 2^42891447 is an apocalyptic number.

42891447 is a deficient number, since it is larger than the sum of its proper divisors (14569033).

42891447 is a wasteful number, since it uses less digits than its factorization.

42891447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67973.

The product of its digits is 64512, while the sum is 39.

The square root of 42891447 is about 6549.1562051916. The cubic root of 42891447 is about 350.0447480202.

The spelling of 42891447 in words is "forty-two million, eight hundred ninety-one thousand, four hundred forty-seven".