1251422000 has 80 divisors (see below), whose sum is σ = 3090552192. Its totient is φ = 489881600.

The previous prime is 1251421987. The next prime is 1251422021. The reversal of 1251422000 is 2241521.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 1251422000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87344 + ... + 100656.

Almost surely, 2^1251422000 is an apocalyptic number.

1251422000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251422000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1545276096).

1251422000 is an abundant number, since it is smaller than the sum of its proper divisors (1839130192).

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

1251422000 is a wasteful number, since it uses less digits than its factorization.

1251422000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13383 (or 13367 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 1251422000 is about 35375.4434601179. The cubic root of 1251422000 is about 1077.6256710351.

Adding to 1251422000 its reverse (2241521), we get a palindrome (1253663521).

The spelling of 1251422000 in words is "one billion, two hundred fifty-one million, four hundred twenty-two thousand".