1055043990 has 384 divisors, whose sum is σ = 3773952000. Its totient is φ = 201519360.

The previous prime is 1055043947. The next prime is 1055044013. The reversal of 1055043990 is 993405501.

1055043990 is a `hidden beast` number, since 10 + 550 + 4 + 3 + 9 + 90 = 666.

It is a super-2 number, since 2×1055043990² = 2226235641670240200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 4414291 + ... + 4414529.

It is an arithmetic number, because the mean of its divisors is an integer number (9828000).

Almost surely, 2^1055043990 is an apocalyptic number.

1055043990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1055043990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1886976000).

1055043990 is an abundant number, since it is smaller than the sum of its proper divisors (2718908010).

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

1055043990 is a wasteful number, since it uses less digits than its factorization.

1055043990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 1055043990 is about 32481.4407008064. The cubic root of 1055043990 is about 1018.0212792579.

The spelling of 1055043990 in words is "one billion, fifty-five million, forty-three thousand, nine hundred ninety".