1020391722 has 144 divisors (see below), whose sum is σ = 2729240640. Its totient is φ = 276812640.

The previous prime is 1020391703. The next prime is 1020391733. The reversal of 1020391722 is 2271930201.

It is a super-3 number, since 3×1020391722³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 19252648 + ... + 19252700.

It is an arithmetic number, because the mean of its divisors is an integer number (18953060).

Almost surely, 2^1020391722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1020391722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1364620320).

1020391722 is an abundant number, since it is smaller than the sum of its proper divisors (1708848918).

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

1020391722 is an equidigital number, since it uses as much as digits as its factorization.

1020391722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 1020391722 is about 31943.5709024523. The cubic root of 1020391722 is about 1006.7515545908.

Multiplying 1020391722 by its product of nonzero digits (1512), we get a square (1542832283664 = 1242108²).

The spelling of 1020391722 in words is "one billion, twenty million, three hundred ninety-one thousand, seven hundred twenty-two".