1238281636 has 24 divisors (see below), whose sum is σ = 2262484224. Its totient is φ = 591888000.

The previous prime is 1238281633. The next prime is 1238281637. The reversal of 1238281636 is 6361828321.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1238281633) 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, 258261 + ... + 263011.

It is an arithmetic number, because the mean of its divisors is an integer number (94270176).

Almost surely, 2^1238281636 is an apocalyptic number.

It is an amenable number.

1238281636 is a deficient number, since it is larger than the sum of its proper divisors (1024202588).

1238281636 is a wasteful number, since it uses less digits than its factorization.

1238281636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7611 (or 7609 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 1238281636 is about 35189.2261352818. The cubic root of 1238281636 is about 1073.8405775572.

The spelling of 1238281636 in words is "one billion, two hundred thirty-eight million, two hundred eighty-one thousand, six hundred thirty-six".