42247251 has 24 divisors (see below), whose sum is σ = 66044160. Its totient is φ = 26936712.

The previous prime is 42247237. The next prime is 42247253. The reversal of 42247251 is 15274224.

It is not a de Polignac number, because 42247251 - 2⁶ = 42247187 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42247253) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1810 + ... + 9368.

It is an arithmetic number, because the mean of its divisors is an integer number (2751840).

Almost surely, 2^42247251 is an apocalyptic number.

42247251 is a deficient number, since it is larger than the sum of its proper divisors (23796909).

42247251 is an equidigital number, since it uses as much as digits as its factorization.

42247251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7597 (or 7585 counting only the distinct ones).

The product of its digits is 4480, while the sum is 27.

The square root of 42247251 is about 6499.7885350217. The cubic root of 42247251 is about 348.2834343689.

The spelling of 42247251 in words is "forty-two million, two hundred forty-seven thousand, two hundred fifty-one".