1387726157 has 2 divisors, whose sum is σ = 1387726158. Its totient is φ = 1387726156.

The previous prime is 1387726141. The next prime is 1387726213. The reversal of 1387726157 is 7516277831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1238617636 + 149108521 = 35194^2 + 12211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387726157 - 2⁴ = 1387726141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1387726757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693863078 + 693863079.

It is an arithmetic number, because the mean of its divisors is an integer number (693863079).

Almost surely, 2^1387726157 is an apocalyptic number.

It is an amenable number.

1387726157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387726157 is an equidigital number, since it uses as much as digits as its factorization.

1387726157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 493920, while the sum is 47.

The square root of 1387726157 is about 37252.1966734849. The cubic root of 1387726157 is about 1115.4101481309.

The spelling of 1387726157 in words is "one billion, three hundred eighty-seven million, seven hundred twenty-six thousand, one hundred fifty-seven".