1026221990 has 24 divisors (see below), whose sum is σ = 1859407488. Its totient is φ = 407782560.

The previous prime is 1026221969. The next prime is 1026221993. The reversal of 1026221990 is 991226201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1026221993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1399664 + ... + 1400396.

It is an arithmetic number, because the mean of its divisors is an integer number (77475312).

Almost surely, 2^1026221990 is an apocalyptic number.

1026221990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1026221990 is a deficient number, since it is larger than the sum of its proper divisors (833185498).

1026221990 is an frugal number, since it uses more digits than its factorization.

1026221990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664 (or 931 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1026221990 is about 32034.6997800822. The cubic root of 1026221990 is about 1008.6653580144.

The spelling of 1026221990 in words is "one billion, twenty-six million, two hundred twenty-one thousand, nine hundred ninety".