1266238438 has 16 divisors (see below), whose sum is σ = 2014958160. Its totient is φ = 594729216.

The previous prime is 1266238433. The next prime is 1266238483. The reversal of 1266238438 is 8348326621.

It is a junction number, because it is equal to n+sod(n) for n = 1266238394 and 1266238403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266238433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17823 + ... + 53386.

It is an arithmetic number, because the mean of its divisors is an integer number (125934885).

Almost surely, 2^1266238438 is an apocalyptic number.

1266238438 is a deficient number, since it is larger than the sum of its proper divisors (748719722).

1266238438 is a wasteful number, since it uses less digits than its factorization.

1266238438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71751.

The product of its digits is 331776, while the sum is 43.

The square root of 1266238438 is about 35584.2442381456. The cubic root of 1266238438 is about 1081.8619111211.

The spelling of 1266238438 in words is "one billion, two hundred sixty-six million, two hundred thirty-eight thousand, four hundred thirty-eight".