1438775911 has 4 divisors (see below), whose sum is σ = 1451975800. Its totient is φ = 1425576024.

The previous prime is 1438775903. The next prime is 1438775917. The reversal of 1438775911 is 1195778341.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1438775911 - 2³ = 1438775903 is a prime.

It is a super-2 number, since 2×1438775911² = 4140152244147759842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1438775917) 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, 6599781 + ... + 6599998.

It is an arithmetic number, because the mean of its divisors is an integer number (362993950).

Almost surely, 2^1438775911 is an apocalyptic number.

1438775911 is a deficient number, since it is larger than the sum of its proper divisors (13199889).

1438775911 is a wasteful number, since it uses less digits than its factorization.

1438775911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13199888.

The product of its digits is 211680, while the sum is 46.

The square root of 1438775911 is about 37931.1997042013. The cubic root of 1438775911 is about 1128.9231684337.

The spelling of 1438775911 in words is "one billion, four hundred thirty-eight million, seven hundred seventy-five thousand, nine hundred eleven".