1994529420 has 336 divisors, whose sum is σ = 7172353440. Its totient is φ = 461334528.

The previous prime is 1994529409. The next prime is 1994529421. The reversal of 1994529420 is 249254991.

1994529420 is a `hidden beast` number, since 1 + 99 + 452 + 94 + 20 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1994529421) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 3221871 + ... + 3222489.

It is an arithmetic number, because the mean of its divisors is an integer number (21346290).

Almost surely, 2^1994529420 is an apocalyptic number.

1994529420 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 1994529420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3586176720).

1994529420 is an abundant number, since it is smaller than the sum of its proper divisors (5177824020).

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

1994529420 is a wasteful number, since it uses less digits than its factorization.

1994529420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676 (or 659 counting only the distinct ones).

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

The square root of 1994529420 is about 44660.1547243177. The cubic root of 1994529420 is about 1258.7712510962.

The spelling of 1994529420 in words is "one billion, nine hundred ninety-four million, five hundred twenty-nine thousand, four hundred twenty".