1251420330 has 16 divisors (see below), whose sum is σ = 3003408864. Its totient is φ = 333712080.

The previous prime is 1251420329. The next prime is 1251420341. The reversal of 1251420330 is 330241521.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1251420297 and 1251420306.

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, 20856976 + ... + 20857035.

It is an arithmetic number, because the mean of its divisors is an integer number (187713054).

Almost surely, 2^1251420330 is an apocalyptic number.

1251420330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1251420330 is an abundant number, since it is smaller than the sum of its proper divisors (1751988534).

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

1251420330 is a wasteful number, since it uses less digits than its factorization.

1251420330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41714021.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1251420330 is about 35375.4198561657. The cubic root of 1251420330 is about 1077.6251916775.

Adding to 1251420330 its reverse (330241521), we get a palindrome (1581661851).

It can be divided in two parts, 125 and 1420330, that added together give a triangular number (1420455 = T₁₆₈₅).

The spelling of 1251420330 in words is "one billion, two hundred fifty-one million, four hundred twenty thousand, three hundred thirty".