1438943811 has 16 divisors (see below), whose sum is σ = 1943633664. Its totient is φ = 946841184.

The previous prime is 1438943789. The next prime is 1438943827. The reversal of 1438943811 is 1183498341.

It is a happy number.

It is not a de Polignac number, because 1438943811 - 2²² = 1434749507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1438941811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80826 + ... + 97008.

It is an arithmetic number, because the mean of its divisors is an integer number (121477104).

Almost surely, 2^1438943811 is an apocalyptic number.

1438943811 is a deficient number, since it is larger than the sum of its proper divisors (504689853).

1438943811 is a wasteful number, since it uses less digits than its factorization.

1438943811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16570.

The product of its digits is 82944, while the sum is 42.

The square root of 1438943811 is about 37933.4128572687. The cubic root of 1438943811 is about 1128.9670804903.

The spelling of 1438943811 in words is "one billion, four hundred thirty-eight million, nine hundred forty-three thousand, eight hundred eleven".