1138197473 has 4 divisors (see below), whose sum is σ = 1300797120. Its totient is φ = 975597828.

The previous prime is 1138197421. The next prime is 1138197491. The reversal of 1138197473 is 3747918311.

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 not a de Polignac number, because 1138197473 - 2⁶ = 1138197409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1138197493) 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, 81299813 + ... + 81299826.

It is an arithmetic number, because the mean of its divisors is an integer number (325199280).

Almost surely, 2^1138197473 is an apocalyptic number.

It is an amenable number.

1138197473 is a deficient number, since it is larger than the sum of its proper divisors (162599647).

1138197473 is an equidigital number, since it uses as much as digits as its factorization.

1138197473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162599646.

The product of its digits is 127008, while the sum is 44.

The square root of 1138197473 is about 33737.1823512279. The cubic root of 1138197473 is about 1044.0930519102.

The spelling of 1138197473 in words is "one billion, one hundred thirty-eight million, one hundred ninety-seven thousand, four hundred seventy-three".