1388674640 has 40 divisors (see below), whose sum is σ = 3269552640. Its totient is φ = 548436096.

The previous prime is 1388674627. The next prime is 1388674709. The reversal of 1388674640 is 464768831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

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, 103544 + ... + 116183.

It is an arithmetic number, because the mean of its divisors is an integer number (81738816).

Almost surely, 2^1388674640 is an apocalyptic number.

1388674640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1388674640 is an abundant number, since it is smaller than the sum of its proper divisors (1880878000).

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

1388674640 is a wasteful number, since it uses less digits than its factorization.

1388674640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219819 (or 219813 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 47.

The square root of 1388674640 is about 37264.9250636574. The cubic root of 1388674640 is about 1115.6642104138.

The spelling of 1388674640 in words is "one billion, three hundred eighty-eight million, six hundred seventy-four thousand, six hundred forty".