1267423236 has 36 divisors (see below), whose sum is σ = 3392222652. Its totient is φ = 397622784.

The previous prime is 1267423231. The next prime is 1267423249. The reversal of 1267423236 is 6323247621.

It can be written as a sum of positive squares in 2 ways, for example, as 869660100 + 397763136 = 29490^2 + 19944^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1267423236.

It is not an unprimeable number, because it can be changed into a prime (1267423231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1034865 + ... + 1036088.

It is an arithmetic number, because the mean of its divisors is an integer number (94228407).

Almost surely, 2^1267423236 is an apocalyptic number.

It is an amenable number.

1267423236 is an abundant number, since it is smaller than the sum of its proper divisors (2124799416).

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

1267423236 is a wasteful number, since it uses less digits than its factorization.

1267423236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070980 (or 2070975 counting only the distinct ones).

The product of its digits is 72576, while the sum is 36.

The square root of 1267423236 is about 35600.8881349890. Note that the first 3 decimals coincide. The cubic root of 1267423236 is about 1082.1992325964.

The spelling of 1267423236 in words is "one billion, two hundred sixty-seven million, four hundred twenty-three thousand, two hundred thirty-six".