1388062980 has 120 divisors (see below), whose sum is σ = 4363832088. Its totient is φ = 369349632.

The previous prime is 1388062967. The next prime is 1388062987. The reversal of 1388062980 is 892608831.

1388062980 is a `hidden beast` number, since 13 + 8 + 8 + 0 + 629 + 8 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 679332096 + 708730884 = 26064^2 + 26622^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1388062987) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1420252 + ... + 1421228.

Almost surely, 2^1388062980 is an apocalyptic number.

1388062980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1388062980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2181916044).

1388062980 is an abundant number, since it is smaller than the sum of its proper divisors (2975769108).

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

1388062980 is a wasteful number, since it uses less digits than its factorization.

1388062980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875 (or 1864 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 1388062980 is about 37256.7172466926. The cubic root of 1388062980 is about 1115.5003833690.

The spelling of 1388062980 in words is "one billion, three hundred eighty-eight million, sixty-two thousand, nine hundred eighty".