1385728377 has 8 divisors (see below), whose sum is σ = 2015604960. Its totient is φ = 839835360.

The previous prime is 1385728367. The next prime is 1385728433. The reversal of 1385728377 is 7738275831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1385728377 - 2⁶ = 1385728313 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1385728367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20995852 + ... + 20995917.

It is an arithmetic number, because the mean of its divisors is an integer number (251950620).

Almost surely, 2^1385728377 is an apocalyptic number.

It is an amenable number.

1385728377 is a deficient number, since it is larger than the sum of its proper divisors (629876583).

1385728377 is a wasteful number, since it uses less digits than its factorization.

1385728377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41991783.

The product of its digits is 1975680, while the sum is 51.

The square root of 1385728377 is about 37225.3727583754. The cubic root of 1385728377 is about 1114.8746404004.

The spelling of 1385728377 in words is "one billion, three hundred eighty-five million, seven hundred twenty-eight thousand, three hundred seventy-seven".