1238781261 has 8 divisors (see below), whose sum is σ = 1668062304. Its totient is φ = 817677200.

The previous prime is 1238781227. The next prime is 1238781293. The reversal of 1238781261 is 1621878321.

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

It is a cyclic number.

It is not a de Polignac number, because 1238781261 - 2¹⁹ = 1238256973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1238781161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2043891 + ... + 2044496.

It is an arithmetic number, because the mean of its divisors is an integer number (208507788).

Almost surely, 2^1238781261 is an apocalyptic number.

It is an amenable number.

1238781261 is a deficient number, since it is larger than the sum of its proper divisors (429281043).

1238781261 is a wasteful number, since it uses less digits than its factorization.

1238781261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4088491.

The product of its digits is 32256, while the sum is 39.

The square root of 1238781261 is about 35196.3245382242. The cubic root of 1238781261 is about 1073.9849834395.

The spelling of 1238781261 in words is "one billion, two hundred thirty-eight million, seven hundred eighty-one thousand, two hundred sixty-one".