1138690797 has 4 divisors (see below), whose sum is σ = 1518254400. Its totient is φ = 759127196.

The previous prime is 1138690759. The next prime is 1138690801. The reversal of 1138690797 is 7970968311.

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 1138690797 - 2⁶ = 1138690733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138690727) 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, 189781797 + ... + 189781802.

It is an arithmetic number, because the mean of its divisors is an integer number (379563600).

Almost surely, 2^1138690797 is an apocalyptic number.

It is an amenable number.

1138690797 is a deficient number, since it is larger than the sum of its proper divisors (379563603).

1138690797 is an equidigital number, since it uses as much as digits as its factorization.

1138690797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379563602.

The product of its (nonzero) digits is 571536, while the sum is 51.

The square root of 1138690797 is about 33744.4928395731. The cubic root of 1138690797 is about 1044.2438756981.

The spelling of 1138690797 in words is "one billion, one hundred thirty-eight million, six hundred ninety thousand, seven hundred ninety-seven".