1138421823 has 64 divisors (see below), whose sum is σ = 1983578112. Its totient is φ = 563143680.

The previous prime is 1138421819. The next prime is 1138421839. The reversal of 1138421823 is 3281248311.

It is not a de Polignac number, because 1138421823 - 2² = 1138421819 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138421863) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1875186 + ... + 1875792.

It is an arithmetic number, because the mean of its divisors is an integer number (30993408).

Almost surely, 2^1138421823 is an apocalyptic number.

1138421823 is a deficient number, since it is larger than the sum of its proper divisors (845156289).

1138421823 is a wasteful number, since it uses less digits than its factorization.

1138421823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004.

The product of its digits is 9216, while the sum is 33.

The square root of 1138421823 is about 33740.5071538648. The cubic root of 1138421823 is about 1044.1616477654.

The spelling of 1138421823 in words is "one billion, one hundred thirty-eight million, four hundred twenty-one thousand, eight hundred twenty-three".