1247540 has 72 divisors (see below), whose sum is σ = 3255840. Its totient is φ = 399168.

The previous prime is 1247527. The next prime is 1247549. The reversal of 1247540 is 457421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247549) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18587 + ... + 18653.

It is an arithmetic number, because the mean of its divisors is an integer number (45220).

2^1247540 is an apocalyptic number.

1247540 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 1247540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1627920).

1247540 is an abundant number, since it is smaller than the sum of its proper divisors (2008300).

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

1247540 is a wasteful number, since it uses less digits than its factorization.

1247540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 1247540 is about 1116.9333015001. The cubic root of 1247540 is about 107.6510226365.

It can be divided in two parts, 1247 and 540, that multiplied together give a triangular number (673380 = T₁₁₆₀).

The spelling of 1247540 in words is "one million, two hundred forty-seven thousand, five hundred forty".