1261730 has 8 divisors (see below), whose sum is σ = 2271132. Its totient is φ = 504688.

The previous prime is 1261721. The next prime is 1261739. The reversal of 1261730 is 371621.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1261721) and next prime (1261739).

It can be written as a sum of positive squares in 2 ways, for example, as 1194649 + 67081 = 1093^2 + 259^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1261739) 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, 63077 + ... + 63096.

2^1261730 is an apocalyptic number.

1261730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261730 is a deficient number, since it is larger than the sum of its proper divisors (1009402).

1261730 is a wasteful number, since it uses less digits than its factorization.

1261730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126180.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 1261730 is about 1123.2675549485. The cubic root of 1261730 is about 108.0576395570.

It can be divided in two parts, 1261 and 730, that added together give a palindrome (1991).

The spelling of 1261730 in words is "one million, two hundred sixty-one thousand, seven hundred thirty".