1231906 has 8 divisors (see below), whose sum is σ = 1990044. Its totient is φ = 568560.

The previous prime is 1231889. The next prime is 1231943. The reversal of 1231906 is 6091321.

It can be written as a sum of positive squares in 2 ways, for example, as 1229881 + 2025 = 1109^2 + 45^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23665 + ... + 23716.

2^1231906 is an apocalyptic number.

1231906 is a deficient number, since it is larger than the sum of its proper divisors (758138).

1231906 is a wasteful number, since it uses less digits than its factorization.

1231906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47396.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1231906 is about 1109.9126091725. The cubic root of 1231906 is about 107.1994416879.

The spelling of 1231906 in words is "one million, two hundred thirty-one thousand, nine hundred six".