1388019972 has 48 divisors (see below), whose sum is σ = 3319791552. Its totient is φ = 451228800.

The previous prime is 1388019937. The next prime is 1388019991. The reversal of 1388019972 is 2799108831.

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, 72658 + ... + 89750.

It is an arithmetic number, because the mean of its divisors is an integer number (69162324).

Almost surely, 2^1388019972 is an apocalyptic number.

1388019972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1388019972 is an abundant number, since it is smaller than the sum of its proper divisors (1931771580).

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

1388019972 is a wasteful number, since it uses less digits than its factorization.

1388019972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17268 (or 17266 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 1388019972 is about 37256.1400577140. The cubic root of 1388019972 is about 1115.4888622933.

The spelling of 1388019972 in words is "one billion, three hundred eighty-eight million, nineteen thousand, nine hundred seventy-two".