1385770509 has 24 divisors (see below), whose sum is σ = 2068160640. Its totient is φ = 893459808.

The previous prime is 1385770499. The next prime is 1385770523. The reversal of 1385770509 is 9050775831.

1385770509 is a `hidden beast` number, since 138 + 5 + 7 + 7 + 0 + 509 = 666.

It is not a de Polignac number, because 1385770509 - 2⁷ = 1385770381 is a prime.

It is a super-2 number, since 2×1385770509² = 3840719807228238162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385770559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43152 + ... + 68070.

It is an arithmetic number, because the mean of its divisors is an integer number (86173360).

Almost surely, 2^1385770509 is an apocalyptic number.

It is an amenable number.

1385770509 is a deficient number, since it is larger than the sum of its proper divisors (682390131).

1385770509 is a wasteful number, since it uses less digits than its factorization.

1385770509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25129 (or 25126 counting only the distinct ones).

The product of its (nonzero) digits is 264600, while the sum is 45.

The square root of 1385770509 is about 37225.9386584140. The cubic root of 1385770509 is about 1114.8859392530.

The spelling of 1385770509 in words is "one billion, three hundred eighty-five million, seven hundred seventy thousand, five hundred nine".