1238806157 has 4 divisors (see below), whose sum is σ = 1238972220. Its totient is φ = 1238640096.

The previous prime is 1238806147. The next prime is 1238806169. The reversal of 1238806157 is 7516088321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 559369801 + 679436356 = 23651^2 + 26066^2 .

It is a cyclic number.

It is not a de Polignac number, because 1238806157 - 2⁸ = 1238805901 is a prime.

It is a super-2 number, since 2×1238806157² = 3069281389242217298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1238806147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71288 + ... + 86945.

It is an arithmetic number, because the mean of its divisors is an integer number (309743055).

Almost surely, 2^1238806157 is an apocalyptic number.

It is an amenable number.

1238806157 is a deficient number, since it is larger than the sum of its proper divisors (166063).

1238806157 is an equidigital number, since it uses as much as digits as its factorization.

1238806157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166062.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 1238806157 is about 35196.6782097402. The cubic root of 1238806157 is about 1073.9921780782.

The spelling of 1238806157 in words is "one billion, two hundred thirty-eight million, eight hundred six thousand, one hundred fifty-seven".