1138717421 has 4 divisors (see below), whose sum is σ = 1152436992. Its totient is φ = 1124997852.

The previous prime is 1138717417. The next prime is 1138717423. The reversal of 1138717421 is 1247178311.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1247178311 = 6397 ⋅194963.

It is a cyclic number.

It is not a de Polignac number, because 1138717421 - 2² = 1138717417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138717423) 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, 6859661 + ... + 6859826.

It is an arithmetic number, because the mean of its divisors is an integer number (288109248).

Almost surely, 2^1138717421 is an apocalyptic number.

It is an amenable number.

1138717421 is a deficient number, since it is larger than the sum of its proper divisors (13719571).

1138717421 is an equidigital number, since it uses as much as digits as its factorization.

1138717421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13719570.

The product of its digits is 9408, while the sum is 35.

The square root of 1138717421 is about 33744.8873312684. The cubic root of 1138717421 is about 1044.2520142060.

The spelling of 1138717421 in words is "one billion, one hundred thirty-eight million, seven hundred seventeen thousand, four hundred twenty-one".