1238992992 has 72 divisors (see below), whose sum is σ = 3545136504. Its totient is φ = 410448384.

The previous prime is 1238992973. The next prime is 1238993017. The reversal of 1238992992 is 2992998321.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×1238992992² = 3070207268450224128, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33748 + ... + 60140.

It is an arithmetic number, because the mean of its divisors is an integer number (49238007).

Almost surely, 2^1238992992 is an apocalyptic number.

1238992992 is a gapful number since it is divisible by the number (12) 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 1238992992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1772568252).

1238992992 is an abundant number, since it is smaller than the sum of its proper divisors (2306143512).

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

1238992992 is a wasteful number, since it uses less digits than its factorization.

1238992992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26572 (or 26561 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 54.

The square root of 1238992992 is about 35199.3322663939. The cubic root of 1238992992 is about 1074.0461680267.

The spelling of 1238992992 in words is "one billion, two hundred thirty-eight million, nine hundred ninety-two thousand, nine hundred ninety-two".