1388247856 has 20 divisors (see below), whose sum is σ = 2691404872. Its totient is φ = 693691776.

The previous prime is 1388247811. The next prime is 1388247857. The reversal of 1388247856 is 6587428831.

It is not an unprimeable number, because it can be changed into a prime (1388247857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331 + ... + 52693.

Almost surely, 2^1388247856 is an apocalyptic number.

1388247856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1388247856 is a deficient number, since it is larger than the sum of its proper divisors (1303157016).

1388247856 is a wasteful number, since it uses less digits than its factorization.

1388247856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54028 (or 54022 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 52.

The square root of 1388247856 is about 37259.1982737149. The cubic root of 1388247856 is about 1115.5499056401.

The spelling of 1388247856 in words is "one billion, three hundred eighty-eight million, two hundred forty-seven thousand, eight hundred fifty-six".