251000420 has 24 divisors (see below), whose sum is σ = 575019648. Its totient is φ = 91272800.

The previous prime is 251000419. The next prime is 251000441. The reversal of 251000420 is 24000152.

It is a junction number, because it is equal to n+sod(n) for n = 251000395 and 251000404.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 570236 + ... + 570675.

It is an arithmetic number, because the mean of its divisors is an integer number (23959152).

Almost surely, 2^251000420 is an apocalyptic number.

251000420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251000420 is an abundant number, since it is smaller than the sum of its proper divisors (324019228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251000420 is a wasteful number, since it uses less digits than its factorization.

251000420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140931 (or 1140929 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 251000420 is about 15842.9927728318. The cubic root of 251000420 is about 630.7997067064.

Adding to 251000420 its reverse (24000152), we get a palindrome (275000572).

The spelling of 251000420 in words is "two hundred fifty-one million, four hundred twenty", and thus it is an aban number.