2391989680 has 20 divisors (see below), whose sum is σ = 5561376192. Its totient is φ = 956795840.

The previous prime is 2391989657. The next prime is 2391989683. The reversal of 2391989680 is 869891932.

2391989680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×2391989680² = 11443229258453004800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2391989683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14949856 + ... + 14950015.

Almost surely, 2^2391989680 is an apocalyptic number.

2391989680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2391989680 is an abundant number, since it is smaller than the sum of its proper divisors (3169386512).

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

2391989680 is a wasteful number, since it uses less digits than its factorization.

2391989680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29899884 (or 29899878 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 55.

The square root of 2391989680 is about 48907.9715383903. The cubic root of 2391989680 is about 1337.3746920774.

The spelling of 2391989680 in words is "two billion, three hundred ninety-one million, nine hundred eighty-nine thousand, six hundred eighty".