3639979400 has 96 divisors (see below), whose sum is σ = 8587486080. Its totient is φ = 1434720000.

The previous prime is 3639979381. The next prime is 3639979411. The reversal of 3639979400 is 49799363.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7413155 + ... + 7413645.

It is an arithmetic number, because the mean of its divisors is an integer number (89452980).

Almost surely, 2^3639979400 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3639979400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4293743040).

3639979400 is an abundant number, since it is smaller than the sum of its proper divisors (4947506680).

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

3639979400 is a wasteful number, since it uses less digits than its factorization.

3639979400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975 (or 966 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 50.

The square root of 3639979400 is about 60332.2417949143. The cubic root of 3639979400 is about 1538.2714343179.

The spelling of 3639979400 in words is "three billion, six hundred thirty-nine million, nine hundred seventy-nine thousand, four hundred".