1138138477 has 4 divisors (see below), whose sum is σ = 1300729696. Its totient is φ = 975547260.

The previous prime is 1138138453. The next prime is 1138138481. The reversal of 1138138477 is 7748318311.

It is a happy number.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1138138477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138138277) 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, 81295599 + ... + 81295612.

It is an arithmetic number, because the mean of its divisors is an integer number (325182424).

Almost surely, 2^1138138477 is an apocalyptic number.

It is an amenable number.

1138138477 is a deficient number, since it is larger than the sum of its proper divisors (162591219).

1138138477 is an equidigital number, since it uses as much as digits as its factorization.

1138138477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162591218.

The product of its digits is 112896, while the sum is 43.

The square root of 1138138477 is about 33736.3079930214. The cubic root of 1138138477 is about 1044.0750121647.

The spelling of 1138138477 in words is "one billion, one hundred thirty-eight million, one hundred thirty-eight thousand, four hundred seventy-seven".