2391447985920 has 864 divisors, whose sum is σ = 9714270838272. Its totient is φ = 531799769088.

The previous prime is 2391447985909. The next prime is 2391447985957. The reversal of 2391447985920 is 295897441932.

2391447985920 is a `hidden beast` number, since 2 + 3 + 91 + 4 + 479 + 8 + 59 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 981306942 + ... + 981309378.

Almost surely, 2^{2391447985920} is an apocalyptic number.

2391447985920 is a gapful number since it is divisible by the number (20) 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 2391447985920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4857135419136).

2391447985920 is an abundant number, since it is smaller than the sum of its proper divisors (7322822852352).

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

2391447985920 is a wasteful number, since it uses less digits than its factorization.

2391447985920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2797 (or 2780 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 63.

The spelling of 2391447985920 in words is "two trillion, three hundred ninety-one billion, four hundred forty-seven million, nine hundred eighty-five thousand, nine hundred twenty".