1388212992 has 90 divisors (see below), whose sum is σ = 4139461788. Its totient is φ = 462730752.

The previous prime is 1388212981. The next prime is 1388212993. The reversal of 1388212992 is 2992128831.

It is a happy number.

It is a super-2 number, since 2×1388212992² = 3854270622315184128, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1388212993) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 12738 + ... + 54209.

Almost surely, 2^1388212992 is an apocalyptic number.

1388212992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1388212992 is an abundant number, since it is smaller than the sum of its proper divisors (2751248796).

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

1388212992 is an frugal number, since it uses more digits than its factorization.

1388212992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66975 (or 66952 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 1388212992 is about 37258.7304131528. The cubic root of 1388212992 is about 1115.5405670442.

The spelling of 1388212992 in words is "one billion, three hundred eighty-eight million, two hundred twelve thousand, nine hundred ninety-two".