1994993550 has 432 divisors, whose sum is σ = 6483335040. Its totient is φ = 454766400.

The previous prime is 1994993543. The next prime is 1994993551. The reversal of 1994993550 is 553994991.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1994993551) by changing a digit.

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 215 ways as a sum of consecutive naturals, for example, 33813421 + ... + 33813479.

It is an arithmetic number, because the mean of its divisors is an integer number (15007720).

Almost surely, 2^1994993550 is an apocalyptic number.

1994993550 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 1994993550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3241667520).

1994993550 is an abundant number, since it is smaller than the sum of its proper divisors (4488341490).

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

1994993550 is a wasteful number, since it uses less digits than its factorization.

1994993550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131 (or 103 counting only the distinct ones).

The product of its (nonzero) digits is 1968300, while the sum is 54.

The square root of 1994993550 is about 44665.3506646931. The cubic root of 1994993550 is about 1258.8688828456.

The spelling of 1994993550 in words is "one billion, nine hundred ninety-four million, nine hundred ninety-three thousand, five hundred fifty".