42387251 has 4 divisors (see below), whose sum is σ = 42403032. Its totient is φ = 42371472.

The previous prime is 42387217. The next prime is 42387287. The reversal of 42387251 is 15278324.

42387251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42387251 - 2¹⁸ = 42125107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42387211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2741 + ... + 9606.

It is an arithmetic number, because the mean of its divisors is an integer number (10600758).

Almost surely, 2^42387251 is an apocalyptic number.

42387251 is a deficient number, since it is larger than the sum of its proper divisors (15781).

42387251 is a wasteful number, since it uses less digits than its factorization.

42387251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15780.

The product of its digits is 13440, while the sum is 32.

The square root of 42387251 is about 6510.5492087842. The cubic root of 42387251 is about 348.6677269816.

The spelling of 42387251 in words is "forty-two million, three hundred eighty-seven thousand, two hundred fifty-one".