1138590157 has 4 divisors (see below), whose sum is σ = 1140144220. Its totient is φ = 1137036096.

The previous prime is 1138590133. The next prime is 1138590169. The reversal of 1138590157 is 7510958311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7510958311 = 347 ⋅21645413.

It can be written as a sum of positive squares in 2 ways, for example, as 1058916681 + 79673476 = 32541^2 + 8926^2 .

It is a cyclic number.

It is not a de Polignac number, because 1138590157 - 2¹¹ = 1138588109 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 (1138590127) 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, 775932 + ... + 777397.

It is an arithmetic number, because the mean of its divisors is an integer number (285036055).

Almost surely, 2^1138590157 is an apocalyptic number.

It is an amenable number.

1138590157 is a deficient number, since it is larger than the sum of its proper divisors (1554063).

1138590157 is an equidigital number, since it uses as much as digits as its factorization.

1138590157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554062.

The product of its (nonzero) digits is 37800, while the sum is 40.

The square root of 1138590157 is about 33743.0016003319. The cubic root of 1138590157 is about 1044.2131106007.

The spelling of 1138590157 in words is "one billion, one hundred thirty-eight million, five hundred ninety thousand, one hundred fifty-seven".