1385727720 has 64 divisors (see below), whose sum is σ = 4476971520. Its totient is φ = 341101824.

The previous prime is 1385727719. The next prime is 1385727727. The reversal of 1385727720 is 277275831.

It is not an unprimeable number, because it can be changed into a prime (1385727727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 442584 + ... + 445703.

It is an arithmetic number, because the mean of its divisors is an integer number (69952680).

Almost surely, 2^1385727720 is an apocalyptic number.

1385727720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1385727720 is an abundant number, since it is smaller than the sum of its proper divisors (3091243800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1385727720 is a wasteful number, since it uses less digits than its factorization.

1385727720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888314 (or 888310 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 42.

The square root of 1385727720 is about 37225.3639337482. The cubic root of 1385727720 is about 1114.8744642060.

The spelling of 1385727720 in words is "one billion, three hundred eighty-five million, seven hundred twenty-seven thousand, seven hundred twenty".