1385642726 has 16 divisors (see below), whose sum is σ = 2260081824. Its totient is φ = 633317184.

The previous prime is 1385642719. The next prime is 1385642729. The reversal of 1385642726 is 6272465831.

It is a super-2 number, since 2×1385642726² = 3840011528233422152, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385642729) 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 7 ways as a sum of consecutive naturals, for example, 256031 + ... + 261386.

It is an arithmetic number, because the mean of its divisors is an integer number (141255114).

Almost surely, 2^1385642726 is an apocalyptic number.

1385642726 is a deficient number, since it is larger than the sum of its proper divisors (874439098).

1385642726 is a wasteful number, since it uses less digits than its factorization.

1385642726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517535.

The product of its digits is 483840, while the sum is 44.

The square root of 1385642726 is about 37224.2223021516. Note that the first 3 decimals coincide. The cubic root of 1385642726 is about 1114.8516700268.

The spelling of 1385642726 in words is "one billion, three hundred eighty-five million, six hundred forty-two thousand, seven hundred twenty-six".