42784791 has 16 divisors (see below), whose sum is σ = 66528000. Its totient is φ = 24447864.

The previous prime is 42784787. The next prime is 42784799. The reversal of 42784791 is 19748724.

It is a happy number.

It is not a de Polignac number, because 42784791 - 2² = 42784787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42784799) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19761 + ... + 21818.

It is an arithmetic number, because the mean of its divisors is an integer number (4158000).

Almost surely, 2^42784791 is an apocalyptic number.

42784791 is a deficient number, since it is larger than the sum of its proper divisors (23743209).

42784791 is an equidigital number, since it uses as much as digits as its factorization.

42784791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41603 (or 41589 counting only the distinct ones).

The product of its digits is 112896, while the sum is 42.

The square root of 42784791 is about 6541.0084084948. The cubic root of 42784791 is about 349.7543609779.

The spelling of 42784791 in words is "forty-two million, seven hundred eighty-four thousand, seven hundred ninety-one".