1261668 has 24 divisors (see below), whose sum is σ = 3007872. Its totient is φ = 411424.

The previous prime is 1261649. The next prime is 1261697. The reversal of 1261668 is 8661621.

It is a super-2 number, since 2×1261668² = 3183612284448, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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, 555 + ... + 1682.

It is an arithmetic number, because the mean of its divisors is an integer number (125328).

2^1261668 is an apocalyptic number.

It is an amenable number.

1261668 is an abundant number, since it is smaller than the sum of its proper divisors (1746204).

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

1261668 is a wasteful number, since it uses less digits than its factorization.

1261668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2291 (or 2289 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 1261668 is about 1123.2399565543. The cubic root of 1261668 is about 108.0558695842.

The spelling of 1261668 in words is "one million, two hundred sixty-one thousand, six hundred sixty-eight".