1261380 has 24 divisors (see below), whose sum is σ = 3532032. Its totient is φ = 336352.

The previous prime is 1261373. The next prime is 1261387. The reversal of 1261380 is 831621.

It is an interprime number because it is at equal distance from previous prime (1261373) and next prime (1261387).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1261387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10452 + ... + 10571.

It is an arithmetic number, because the mean of its divisors is an integer number (147168).

2^1261380 is an apocalyptic number.

1261380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261380 is an abundant number, since it is smaller than the sum of its proper divisors (2270652).

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

1261380 is a wasteful number, since it uses less digits than its factorization.

1261380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21035 (or 21033 counting only the distinct ones).

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

The square root of 1261380 is about 1123.1117486697. Note that the first 3 decimals coincide. The cubic root of 1261380 is about 108.0476470146.

The spelling of 1261380 in words is "one million, two hundred sixty-one thousand, three hundred eighty".