4020989478 has 96 divisors (see below), whose sum is σ = 9299598336. Its totient is φ = 1156584000.

The previous prime is 4020989459. The next prime is 4020989501. The reversal of 4020989478 is 8749890204.

It is a self number, because there is not a number n which added to its sum of digits gives 4020989478.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1191133 + ... + 1194503.

It is an arithmetic number, because the mean of its divisors is an integer number (96870816).

Almost surely, 2^4020989478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4020989478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4649799168).

4020989478 is an abundant number, since it is smaller than the sum of its proper divisors (5278608858).

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

4020989478 is a wasteful number, since it uses less digits than its factorization.

4020989478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3482 (or 3471 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 51.

The square root of 4020989478 is about 63411.2724836838. The cubic root of 4020989478 is about 1590.1727694861.

The spelling of 4020989478 in words is "four billion, twenty million, nine hundred eighty-nine thousand, four hundred seventy-eight".