1338971157 has 6 divisors (see below), whose sum is σ = 1934069462. Its totient is φ = 892647432.

The previous prime is 1338971099. The next prime is 1338971159. The reversal of 1338971157 is 7511798331.

It can be written as a sum of positive squares in only one way, i.e., 716418756 + 622552401 = 26766^2 + 24951^2 .

It is not a de Polignac number, because 1338971157 - 2¹¹ = 1338969109 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 (1338971159) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74387278 + ... + 74387295.

Almost surely, 2^1338971157 is an apocalyptic number.

It is an amenable number.

1338971157 is a deficient number, since it is larger than the sum of its proper divisors (595098305).

1338971157 is a wasteful number, since it uses less digits than its factorization.

1338971157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148774579 (or 148774576 counting only the distinct ones).

The product of its digits is 158760, while the sum is 45.

The square root of 1338971157 is about 36591.9548124994. The cubic root of 1338971157 is about 1102.1915418871.

The spelling of 1338971157 in words is "one billion, three hundred thirty-eight million, nine hundred seventy-one thousand, one hundred fifty-seven".