1385051805 has 40 divisors (see below), whose sum is σ = 2519940192. Its totient is φ = 727654752.

The previous prime is 1385051777. The next prime is 1385051807. The reversal of 1385051805 is 5081505831.

1385051805 is a `hidden beast` number, since 138 + 5 + 0 + 518 + 0 + 5 = 666.

It is not a de Polignac number, because 1385051805 - 2⁷ = 1385051677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1385051805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385051807) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1614 + ... + 52656.

Almost surely, 2^1385051805 is an apocalyptic number.

1385051805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1385051805 is a deficient number, since it is larger than the sum of its proper divisors (1134888387).

1385051805 is an equidigital number, since it uses as much as digits as its factorization.

1385051805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51127 (or 51118 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 36.

The square root of 1385051805 is about 37216.2841374579. The cubic root of 1385051805 is about 1114.6931676648.

The spelling of 1385051805 in words is "one billion, three hundred eighty-five million, fifty-one thousand, eight hundred five".