1385715640 has 32 divisors (see below), whose sum is σ = 3131496000. Its totient is φ = 551862144.

The previous prime is 1385715637. The next prime is 1385715689. The reversal of 1385715640 is 465175831.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1385715593 and 1385715602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66480 + ... + 84799.

It is an arithmetic number, because the mean of its divisors is an integer number (97859250).

Almost surely, 2^1385715640 is an apocalyptic number.

1385715640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1385715640 is an abundant number, since it is smaller than the sum of its proper divisors (1745780360).

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

1385715640 is a wasteful number, since it uses less digits than its factorization.

1385715640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151519 (or 151515 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 1385715640 is about 37225.2016784329. The cubic root of 1385715640 is about 1114.8712245790.

The spelling of 1385715640 in words is "one billion, three hundred eighty-five million, seven hundred fifteen thousand, six hundred forty".