1993553990 has 16 divisors (see below), whose sum is σ = 3589213680. Its totient is φ = 797240160.

The previous prime is 1993553963. The next prime is 1993554037. The reversal of 1993553990 is 993553991.

It is a super-2 number, since 2×1993553990² = 7948515022089840200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29096 + ... + 69524.

It is an arithmetic number, because the mean of its divisors is an integer number (224325855).

Almost surely, 2^1993553990 is an apocalyptic number.

1993553990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1993553990 is a deficient number, since it is larger than the sum of its proper divisors (1595659690).

1993553990 is a wasteful number, since it uses less digits than its factorization.

1993553990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45367.

The product of its (nonzero) digits is 1476225, while the sum is 53.

The square root of 1993553990 is about 44649.2328041591. The cubic root of 1993553990 is about 1258.5660158089.

Subtracting from 1993553990 its reverse (993553991), we obtain a palindrome (999999999).

The spelling of 1993553990 in words is "one billion, nine hundred ninety-three million, five hundred fifty-three thousand, nine hundred ninety".