1387563881 has 4 divisors (see below), whose sum is σ = 1513706064. Its totient is φ = 1261421700.

The previous prime is 1387563823. The next prime is 1387563883. The reversal of 1387563881 is 1883657831.

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.

It is not a de Polignac number, because 1387563881 - 2¹⁸ = 1387301737 is a prime.

It is a super-2 number, since 2×1387563881² = 3850667047711564322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1387563883) 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, 63071075 + ... + 63071096.

It is an arithmetic number, because the mean of its divisors is an integer number (378426516).

Almost surely, 2^1387563881 is an apocalyptic number.

1387563881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1387563881 is a deficient number, since it is larger than the sum of its proper divisors (126142183).

1387563881 is a wasteful number, since it uses less digits than its factorization.

1387563881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126142182.

The product of its digits is 967680, while the sum is 50.

The square root of 1387563881 is about 37250.0185369081. The cubic root of 1387563881 is about 1115.3666690069.

The spelling of 1387563881 in words is "one billion, three hundred eighty-seven million, five hundred sixty-three thousand, eight hundred eighty-one".