1385937649 has 4 divisors (see below), whose sum is σ = 1400225764. Its totient is φ = 1371649536.

The previous prime is 1385937643. The next prime is 1385937673. The reversal of 1385937649 is 9467395831.

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

It can be written as a sum of positive squares in 2 ways, for example, as 339738624 + 1046199025 = 18432^2 + 32345^2 .

It is a cyclic number.

It is not a de Polignac number, because 1385937649 - 2⁵ = 1385937617 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1385937649.

It is not an unprimeable number, because it can be changed into a prime (1385937643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7143912 + ... + 7144105.

It is an arithmetic number, because the mean of its divisors is an integer number (350056441).

Almost surely, 2^1385937649 is an apocalyptic number.

It is an amenable number.

1385937649 is a deficient number, since it is larger than the sum of its proper divisors (14288115).

1385937649 is an equidigital number, since it uses as much as digits as its factorization.

1385937649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14288114.

The product of its digits is 4898880, while the sum is 55.

The square root of 1385937649 is about 37228.1835307607. The cubic root of 1385937649 is about 1114.9307601772.

The spelling of 1385937649 in words is "one billion, three hundred eighty-five million, nine hundred thirty-seven thousand, six hundred forty-nine".