1291086 has 16 divisors (see below), whose sum is σ = 2869200. Its totient is φ = 430344.

The previous prime is 1291079. The next prime is 1291111. The reversal of 1291086 is 6801921.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11901 + ... + 12008.

It is an arithmetic number, because the mean of its divisors is an integer number (179325).

2^1291086 is an apocalyptic number.

1291086 is an abundant number, since it is smaller than the sum of its proper divisors (1578114).

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

1291086 is a wasteful number, since it uses less digits than its factorization.

1291086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23920 (or 23914 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1291086 is about 1136.2596534243. The cubic root of 1291086 is about 108.8892627288.

It can be divided in two parts, 12910 and 86, that added together give a square (12996 = 114²).

The spelling of 1291086 in words is "one million, two hundred ninety-one thousand, eighty-six".