1231947 has 6 divisors (see below), whose sum is σ = 1779492. Its totient is φ = 821292.

The previous prime is 1231943. The next prime is 1231961. The reversal of 1231947 is 7491321.

It is not a de Polignac number, because 1231947 - 2² = 1231943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1231947.

It is not an unprimeable number, because it can be changed into a prime (1231943) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68433 + ... + 68450.

It is an arithmetic number, because the mean of its divisors is an integer number (296582).

2^1231947 is an apocalyptic number.

1231947 is a deficient number, since it is larger than the sum of its proper divisors (547545).

1231947 is a wasteful number, since it uses less digits than its factorization.

1231947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136889 (or 136886 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 1231947 is about 1109.9310789414. The cubic root of 1231947 is about 107.2006309367.

It can be divided in two parts, 123194 and 7, that added together give a square (123201 = 351²).

The spelling of 1231947 in words is "one million, two hundred thirty-one thousand, nine hundred forty-seven".