1994439780 has 96 divisors (see below), whose sum is σ = 6217303680. Its totient is φ = 530789760.

The previous prime is 1994439739. The next prime is 1994439781. The reversal of 1994439780 is 879344991.

1994439780 is a `hidden beast` number, since 199 + 443 + 9 + 7 + 8 + 0 = 666.

1994439780 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 (54).

It is not an unprimeable number, because it can be changed into a prime (1994439781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 288727 + ... + 295553.

It is an arithmetic number, because the mean of its divisors is an integer number (64763580).

Almost surely, 2^1994439780 is an apocalyptic number.

1994439780 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 1994439780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3108651840).

1994439780 is an abundant number, since it is smaller than the sum of its proper divisors (4222863900).

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

1994439780 is a wasteful number, since it uses less digits than its factorization.

1994439780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7386 (or 7378 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The square root of 1994439780 is about 44659.1511338942. The cubic root of 1994439780 is about 1258.7523931901.

The spelling of 1994439780 in words is "one billion, nine hundred ninety-four million, four hundred thirty-nine thousand, seven hundred eighty".