1338707691 has 24 divisors (see below), whose sum is σ = 1981453760. Its totient is φ = 870485616.

The previous prime is 1338707683. The next prime is 1338707701. The reversal of 1338707691 is 1967078331.

It is not a de Polignac number, because 1338707691 - 2³ = 1338707683 is a prime.

It is a super-3 number, since 3×1338707691³ (a number of 28 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (45) 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 (1338707611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 330420 + ... + 334446.

Almost surely, 2^1338707691 is an apocalyptic number.

1338707691 is a deficient number, since it is larger than the sum of its proper divisors (642746069).

1338707691 is a wasteful number, since it uses less digits than its factorization.

1338707691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4935 (or 4932 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 1338707691 is about 36588.3545817518. The cubic root of 1338707691 is about 1102.1192453222.

The spelling of 1338707691 in words is "one billion, three hundred thirty-eight million, seven hundred seven thousand, six hundred ninety-one".