2179206540 has 144 divisors (see below), whose sum is σ = 7999048512. Its totient is φ = 468799488.

The previous prime is 2179206527. The next prime is 2179206569. The reversal of 2179206540 is 456029712.

2179206540 is a `hidden beast` number, since 21 + 7 + 92 + 0 + 6 + 540 = 666.

It is a super-2 number, since 2×2179206540² = 9497882287957543200, 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 = 2179206495 and 2179206504.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29449 + ... + 72288.

It is an arithmetic number, because the mean of its divisors is an integer number (55548948).

Almost surely, 2^2179206540 is an apocalyptic number.

2179206540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2179206540 is an abundant number, since it is smaller than the sum of its proper divisors (5819841972).

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

2179206540 is a wasteful number, since it uses less digits than its factorization.

2179206540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101776 (or 101771 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 2179206540 is about 46681.9723233713. The cubic root of 2179206540 is about 1296.4809243383.

The spelling of 2179206540 in words is "two billion, one hundred seventy-nine million, two hundred six thousand, five hundred forty".