2170398840 has 64 divisors (see below), whose sum is σ = 6894214560. Its totient is φ = 544727040.

The previous prime is 2170398827. The next prime is 2170398851. The reversal of 2170398840 is 488930712.

It is a super-2 number, since 2×2170398840² = 9421262249346691200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2170398792 and 2170398801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 529921 + ... + 534000.

Almost surely, 2^2170398840 is an apocalyptic number.

2170398840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2170398840 is an abundant number, since it is smaller than the sum of its proper divisors (4723815720).

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

2170398840 is a wasteful number, since it uses less digits than its factorization.

2170398840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063952 (or 1063948 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 2170398840 is about 46587.5395358029. The cubic root of 2170398840 is about 1294.7319033769.

The spelling of 2170398840 in words is "two billion, one hundred seventy million, three hundred ninety-eight thousand, eight hundred forty".