42251247 has 8 divisors (see below), whose sum is σ = 62594480. Its totient is φ = 28167480.

The previous prime is 42251227. The next prime is 42251267. The reversal of 42251247 is 74215224.

It is an interprime number because it is at equal distance from previous prime (42251227) and next prime (42251267).

It is not a de Polignac number, because 42251247 - 2⁷ = 42251119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1564861 = 42251247 / (4 + 2 + 2 + 5 + 1 + 2 + 4 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42251247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42251227) 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, 782404 + ... + 782457.

It is an arithmetic number, because the mean of its divisors is an integer number (7824310).

Almost surely, 2^42251247 is an apocalyptic number.

42251247 is a deficient number, since it is larger than the sum of its proper divisors (20343233).

42251247 is a wasteful number, since it uses less digits than its factorization.

42251247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564870 (or 1564864 counting only the distinct ones).

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

The square root of 42251247 is about 6500.0959223691. The cubic root of 42251247 is about 348.2944149392.

The spelling of 42251247 in words is "forty-two million, two hundred fifty-one thousand, two hundred forty-seven".