1385051806 has 4 divisors (see below), whose sum is σ = 2077577712. Its totient is φ = 692525902.

The previous prime is 1385051777. The next prime is 1385051807. The reversal of 1385051806 is 6081505831.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 346262950 + ... + 346262953.

It is an arithmetic number, because the mean of its divisors is an integer number (519394428).

Almost surely, 2^1385051806 is an apocalyptic number.

1385051806 is a deficient number, since it is larger than the sum of its proper divisors (692525906).

1385051806 is an equidigital number, since it uses as much as digits as its factorization.

1385051806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692525905.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 1385051806 is about 37216.2841508929. The cubic root of 1385051806 is about 1114.6931679331.

It can be divided in two parts, 13850 and 51806, that added together give a palindrome (65656).

The spelling of 1385051806 in words is "one billion, three hundred eighty-five million, fifty-one thousand, eight hundred six".