1387927969 has 4 divisors (see below), whose sum is σ = 1388002480. Its totient is φ = 1387853460.

The previous prime is 1387927963. The next prime is 1387927973. The reversal of 1387927969 is 9697297831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1387927969 - 2⁷ = 1387927841 is a prime.

It is a super-2 number, since 2×1387927969² = 3852688094264929922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1387927963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18502 + ... + 55840.

It is an arithmetic number, because the mean of its divisors is an integer number (347000620).

Almost surely, 2^1387927969 is an apocalyptic number.

It is an amenable number.

1387927969 is a deficient number, since it is larger than the sum of its proper divisors (74511).

1387927969 is an equidigital number, since it uses as much as digits as its factorization.

1387927969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74510.

The product of its digits is 10287648, while the sum is 61.

The square root of 1387927969 is about 37254.9053011815. The cubic root of 1387927969 is about 1115.4642155324.

The spelling of 1387927969 in words is "one billion, three hundred eighty-seven million, nine hundred twenty-seven thousand, nine hundred sixty-nine".