1375391640 has 64 divisors (see below), whose sum is σ = 4715631360. Its totient is φ = 314375040.

The previous prime is 1375391629. The next prime is 1375391653. The reversal of 1375391640 is 461935731.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 817846 + ... + 819525.

It is an arithmetic number, because the mean of its divisors is an integer number (73681740).

Almost surely, 2^1375391640 is an apocalyptic number.

1375391640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1375391640 is an abundant number, since it is smaller than the sum of its proper divisors (3340239720).

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

1375391640 is a wasteful number, since it uses less digits than its factorization.

1375391640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1637392 (or 1637388 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 1375391640 is about 37086.2729321780. The cubic root of 1375391640 is about 1112.0956109671.

The spelling of 1375391640 in words is "one billion, three hundred seventy-five million, three hundred ninety-one thousand, six hundred forty".