1399638881 has 8 divisors (see below), whose sum is σ = 1415207040. Its totient is φ = 1384108992.

The previous prime is 1399638827. The next prime is 1399638901. The reversal of 1399638881 is 1888369931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1399638881 - 2⁶ = 1399638817 is a prime.

It is a super-2 number, since 2×1399638881² = 3917977994413864322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1398638881) 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, 67385 + ... + 85673.

It is an arithmetic number, because the mean of its divisors is an integer number (176900880).

Almost surely, 2^1399638881 is an apocalyptic number.

It is an amenable number.

1399638881 is a deficient number, since it is larger than the sum of its proper divisors (15568159).

1399638881 is a wasteful number, since it uses less digits than its factorization.

1399638881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19135.

The product of its digits is 2239488, while the sum is 56.

The square root of 1399638881 is about 37411.7479008934. The cubic root of 1399638881 is about 1118.5927481358.

The spelling of 1399638881 in words is "one billion, three hundred ninety-nine million, six hundred thirty-eight thousand, eight hundred eighty-one".