1386891272 has 32 divisors (see below), whose sum is σ = 2831938200. Its totient is φ = 632907264.

The previous prime is 1386891271. The next prime is 1386891277. The reversal of 1386891272 is 2721986831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1139332516 + 247558756 = 33754^2 + 15734^2 .

It is not an unprimeable number, because it can be changed into a prime (1386891271) 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, 65663 + ... + 84174.

Almost surely, 2^1386891272 is an apocalyptic number.

It is an amenable number.

1386891272 is an abundant number, since it is smaller than the sum of its proper divisors (1445046928).

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

1386891272 is a wasteful number, since it uses less digits than its factorization.

1386891272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149945 (or 149941 counting only the distinct ones).

The product of its digits is 290304, while the sum is 47.

The square root of 1386891272 is about 37240.9891383137. The cubic root of 1386891272 is about 1115.1864185883.

The spelling of 1386891272 in words is "one billion, three hundred eighty-six million, eight hundred ninety-one thousand, two hundred seventy-two".