1264289138 has 16 divisors (see below), whose sum is σ = 2181902400. Its totient is φ = 538200816.

The previous prime is 1264289137. The next prime is 1264289177. The reversal of 1264289138 is 8319824621.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1264289137) 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, 300956 + ... + 305127.

It is an arithmetic number, because the mean of its divisors is an integer number (136368900).

Almost surely, 2^1264289138 is an apocalyptic number.

1264289138 is a deficient number, since it is larger than the sum of its proper divisors (917613262).

1264289138 is a wasteful number, since it uses less digits than its factorization.

1264289138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606241.

The product of its digits is 165888, while the sum is 44.

The square root of 1264289138 is about 35556.8437575666. The cubic root of 1264289138 is about 1081.3064716270.

The spelling of 1264289138 in words is "one billion, two hundred sixty-four million, two hundred eighty-nine thousand, one hundred thirty-eight".