1272240 has 160 divisors (see below), whose sum is σ = 4761600. Its totient is φ = 311040.

The previous prime is 1272233. The next prime is 1272247. The reversal of 1272240 is 422721.

It is an interprime number because it is at equal distance from previous prime (1272233) and next prime (1272247).

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 (1272247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41025 + ... + 41055.

It is an arithmetic number, because the mean of its divisors is an integer number (29760).

2^1272240 is an apocalyptic number.

1272240 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 1272240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2380800).

1272240 is an abundant number, since it is smaller than the sum of its proper divisors (3489360).

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

1272240 is a wasteful number, since it uses less digits than its factorization.

1272240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 1272240 is about 1127.9361684067. The cubic root of 1272240 is about 108.3568443383.

Adding to 1272240 its reverse (422721), we get a palindrome (1694961).

The spelling of 1272240 in words is "one million, two hundred seventy-two thousand, two hundred forty".