1261720 has 16 divisors (see below), whose sum is σ = 2838960. Its totient is φ = 504672.

The previous prime is 1261717. The next prime is 1261721. The reversal of 1261720 is 271621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261721) 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 3 ways as a sum of consecutive naturals, for example, 15732 + ... + 15811.

It is an arithmetic number, because the mean of its divisors is an integer number (177435).

2^1261720 is an apocalyptic number.

1261720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261720 is an abundant number, since it is smaller than the sum of its proper divisors (1577240).

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

1261720 is a wasteful number, since it uses less digits than its factorization.

1261720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31554 (or 31550 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 1261720 is about 1123.2631036405. The cubic root of 1261720 is about 108.0573540814.

Subtracting from 1261720 its reverse (271621), we obtain a palindrome (990099).

The spelling of 1261720 in words is "one million, two hundred sixty-one thousand, seven hundred twenty".