3942989820 has 1152 divisors, whose sum is σ = 17650483200. Its totient is φ = 718502400.

The previous prime is 3942989819. The next prime is 3942989833. The reversal of 3942989820 is 289892493.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 127193205 + ... + 127193235.

It is an arithmetic number, because the mean of its divisors is an integer number (15321600).

Almost surely, 2^3942989820 is an apocalyptic number.

3942989820 is a gapful number since it is divisible by the number (30) 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 3942989820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8825241600).

3942989820 is an abundant number, since it is smaller than the sum of its proper divisors (13707493380).

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

3942989820 is a wasteful number, since it uses less digits than its factorization.

3942989820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The square root of 3942989820 is about 62793.2306861178. The cubic root of 3942989820 is about 1579.8234353784.

The spelling of 3942989820 in words is "three billion, nine hundred forty-two million, nine hundred eighty-nine thousand, eight hundred twenty".