1251320 has 64 divisors (see below), whose sum is σ = 3326400. Its totient is φ = 414720.

The previous prime is 1251317. The next prime is 1251323. The reversal of 1251320 is 231521.

1251320 = T₁₅₃ + T₁₅₄ + ... + T₂₂₂.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1251317) and next prime (1251323).

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 1251295 and 1251304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11426 + ... + 11534.

It is an arithmetic number, because the mean of its divisors is an integer number (51975).

2^1251320 is an apocalyptic number.

1251320 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 1251320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1663200).

1251320 is an abundant number, since it is smaller than the sum of its proper divisors (2075080).

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

1251320 is a wasteful number, since it uses less digits than its factorization.

1251320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 164 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 1251320 is about 1118.6241549332. The cubic root of 1251320 is about 107.7596392128.

Adding to 1251320 its reverse (231521), we get a palindrome (1482841).

The spelling of 1251320 in words is "one million, two hundred fifty-one thousand, three hundred twenty".