251426428 has 24 divisors (see below), whose sum is σ = 482111280. Its totient is φ = 113781120.

The previous prime is 251426423. The next prime is 251426429. The reversal of 251426428 is 824624152.

It is a junction number, because it is equal to n+sod(n) for n = 251426393 and 251426402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251426423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2401 + ... + 22552.

It is an arithmetic number, because the mean of its divisors is an integer number (20087970).

Almost surely, 2^251426428 is an apocalyptic number.

It is an amenable number.

251426428 is a deficient number, since it is larger than the sum of its proper divisors (230684852).

251426428 is a wasteful number, since it uses less digits than its factorization.

251426428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25197 (or 25195 counting only the distinct ones).

The product of its digits is 30720, while the sum is 34.

The square root of 251426428 is about 15856.4317549693. The cubic root of 251426428 is about 631.1563778678.

The spelling of 251426428 in words is "two hundred fifty-one million, four hundred twenty-six thousand, four hundred twenty-eight".