1385756440 has 32 divisors (see below), whose sum is σ = 3253517280. Its totient is φ = 530202112.

The previous prime is 1385756419. The next prime is 1385756441. The reversal of 1385756440 is 446575831.

It is a super-2 number, since 2×1385756440² = 3840641822002947200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385756441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 752209 + ... + 754048.

It is an arithmetic number, because the mean of its divisors is an integer number (101672415).

Almost surely, 2^1385756440 is an apocalyptic number.

1385756440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1385756440 is an abundant number, since it is smaller than the sum of its proper divisors (1867760840).

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

1385756440 is a wasteful number, since it uses less digits than its factorization.

1385756440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506291 (or 1506287 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 43.

The square root of 1385756440 is about 37225.7496902346. The cubic root of 1385756440 is about 1114.8821662898.

The spelling of 1385756440 in words is "one billion, three hundred eighty-five million, seven hundred fifty-six thousand, four hundred forty".