1022397840 has 240 divisors, whose sum is σ = 3622589568. Its totient is φ = 257900544.

The previous prime is 1022397839. The next prime is 1022397869. The reversal of 1022397840 is 487932201.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1022397795 and 1022397804.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1771632 + ... + 1772208.

Almost surely, 2^1022397840 is an apocalyptic number.

1022397840 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 1022397840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1811294784).

1022397840 is an abundant number, since it is smaller than the sum of its proper divisors (2600191728).

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

1022397840 is a wasteful number, since it uses less digits than its factorization.

1022397840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726 (or 717 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 1022397840 is about 31974.9564503222. The cubic root of 1022397840 is about 1007.4108897085.

The spelling of 1022397840 in words is "one billion, twenty-two million, three hundred ninety-seven thousand, eight hundred forty".