1994405490 has 672 divisors, whose sum is σ = 7535928960. Its totient is φ = 369515520.

The previous prime is 1994405461. The next prime is 1994405503. The reversal of 1994405490 is 945044991.

1994405490 is a `hidden beast` number, since 19 + 94 + 4 + 0 + 549 + 0 = 666.

1994405490 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 335 ways as a sum of consecutive naturals, for example, 104968701 + ... + 104968719.

It is an arithmetic number, because the mean of its divisors is an integer number (11214180).

Almost surely, 2^1994405490 is an apocalyptic number.

1994405490 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 1994405490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3767964480).

1994405490 is an abundant number, since it is smaller than the sum of its proper divisors (5541523470).

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

1994405490 is a wasteful number, since it uses less digits than its factorization.

1994405490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 1994405490 is about 44658.7672243648. The cubic root of 1994405490 is about 1258.7451793236.

The spelling of 1994405490 in words is "one billion, nine hundred ninety-four million, four hundred five thousand, four hundred ninety".