1045951820 has 72 divisors (see below), whose sum is σ = 2297765232. Its totient is φ = 399792640.

The previous prime is 1045951817. The next prime is 1045951831. The reversal of 1045951820 is 281595401.

It is a super-2 number, since 2×1045951820² = 2188030419522624800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1781567 + ... + 1782153.

It is an arithmetic number, because the mean of its divisors is an integer number (31913406).

Almost surely, 2^1045951820 is an apocalyptic number.

1045951820 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 1045951820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1148882616).

1045951820 is an abundant number, since it is smaller than the sum of its proper divisors (1251813412).

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

1045951820 is a wasteful number, since it uses less digits than its factorization.

1045951820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731 (or 688 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 1045951820 is about 32341.1783953523. The cubic root of 1045951820 is about 1015.0884664897.

The spelling of 1045951820 in words is "one billion, forty-five million, nine hundred fifty-one thousand, eight hundred twenty".