2147217840 has 60 divisors (see below), whose sum is σ = 7211075664. Its totient is φ = 572591232.

The previous prime is 2147217803. The next prime is 2147217871. The reversal of 2147217840 is 487127412.

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×2147217840² = 9221088904828531200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2147217795 and 2147217804.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1490404 + ... + 1491843.

Almost surely, 2^2147217840 is an apocalyptic number.

2147217840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2147217840 is an abundant number, since it is smaller than the sum of its proper divisors (5063857824).

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

2147217840 is a wasteful number, since it uses less digits than its factorization.

2147217840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2982266 (or 2982257 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 2147217840 is about 46338.0819628953. The cubic root of 2147217840 is about 1290.1059224364.

The spelling of 2147217840 in words is "two billion, one hundred forty-seven million, two hundred seventeen thousand, eight hundred forty".