1021396992 has 384 divisors, whose sum is σ = 3622993920. Its totient is φ = 247726080.

The previous prime is 1021396979. The next prime is 1021397051. The reversal of 1021396992 is 2996931201.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8042433 + ... + 8042559.

It is an arithmetic number, because the mean of its divisors is an integer number (9434880).

Almost surely, 2^1021396992 is an apocalyptic number.

1021396992 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 1021396992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1811496960).

1021396992 is an abundant number, since it is smaller than the sum of its proper divisors (2601596928).

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

1021396992 is a wasteful number, since it uses less digits than its factorization.

1021396992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 1021396992 is about 31959.3021200401. The cubic root of 1021396992 is about 1007.0820567376.

The spelling of 1021396992 in words is "one billion, twenty-one million, three hundred ninety-six thousand, nine hundred ninety-two".