1251072 has 72 divisors (see below), whose sum is σ = 3720080. Its totient is φ = 414720.

The previous prime is 1251071. The next prime is 1251083. The reversal of 1251072 is 2701521.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×1251072² = 3130362298368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6822 + ... + 7002.

2^1251072 is an apocalyptic number.

1251072 is a gapful number since it is divisible by the number (12) 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 1251072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1860040).

1251072 is an abundant number, since it is smaller than the sum of its proper divisors (2469008).

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

1251072 is an equidigital number, since it uses as much as digits as its factorization.

1251072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 1251072 is about 1118.5132989822. The cubic root of 1251072 is about 107.7525197560.

Adding to 1251072 its reverse (2701521), we get a palindrome (3952593).

The spelling of 1251072 in words is "one million, two hundred fifty-one thousand, seventy-two".