1291646 has 16 divisors (see below), whose sum is σ = 2032128. Its totient is φ = 615000.

The previous prime is 1291637. The next prime is 1291669. The reversal of 1291646 is 6461921.

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, 5021 + ... + 5271.

It is an arithmetic number, because the mean of its divisors is an integer number (127008).

2^1291646 is an apocalyptic number.

1291646 is a deficient number, since it is larger than the sum of its proper divisors (740482).

1291646 is a wasteful number, since it uses less digits than its factorization.

1291646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367.

The product of its digits is 2592, while the sum is 29.

The square root of 1291646 is about 1136.5060492580. The cubic root of 1291646 is about 108.9050037852.

It can be divided in two parts, 1291 and 646, that multiplied together give a triangular number (833986 = T₁₂₉₁).

The spelling of 1291646 in words is "one million, two hundred ninety-one thousand, six hundred forty-six".