42403251 has 16 divisors (see below), whose sum is σ = 61826688. Its totient is φ = 25636800.

The previous prime is 42403247. The next prime is 42403261. The reversal of 42403251 is 15230424.

It is not a de Polignac number, because 42403251 - 2² = 42403247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42403261) 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, 14895 + ... + 17511.

It is an arithmetic number, because the mean of its divisors is an integer number (3864168).

Almost surely, 2^42403251 is an apocalyptic number.

42403251 is a deficient number, since it is larger than the sum of its proper divisors (19423437).

42403251 is a wasteful number, since it uses less digits than its factorization.

42403251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3122.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 42403251 is about 6511.7778678330. Note that the first 3 decimals coincide. The cubic root of 42403251 is about 348.7115922298.

Adding to 42403251 its reverse (15230424), we get a palindrome (57633675).

The spelling of 42403251 in words is "forty-two million, four hundred three thousand, two hundred fifty-one".