1261830 has 16 divisors (see below), whose sum is σ = 3028464. Its totient is φ = 336480.

The previous prime is 1261829. The next prime is 1261831. The reversal of 1261830 is 381621.

It is an interprime number because it is at equal distance from previous prime (1261829) and next prime (1261831).

It is a junction number, because it is equal to n+sod(n) for n = 1261797 and 1261806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261831) 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 7 ways as a sum of consecutive naturals, for example, 21001 + ... + 21060.

It is an arithmetic number, because the mean of its divisors is an integer number (189279).

2^1261830 is an apocalyptic number.

1261830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261830 is an abundant number, since it is smaller than the sum of its proper divisors (1766634).

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

1261830 is a wasteful number, since it uses less digits than its factorization.

1261830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42071.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1261830 is about 1123.3120670588. The cubic root of 1261830 is about 108.0604942296.

The spelling of 1261830 in words is "one million, two hundred sixty-one thousand, eight hundred thirty".