2158417540 has 24 divisors (see below), whose sum is σ = 4544110872. Its totient is φ = 861189120.

The previous prime is 2158417531. The next prime is 2158417553. The reversal of 2158417540 is 457148512.

It can be written as a sum of positive squares in 4 ways, for example, as 1030666816 + 1127750724 = 32104^2 + 33582^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2158417540.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127981 + ... + 143860.

It is an arithmetic number, because the mean of its divisors is an integer number (189337953).

Almost surely, 2^2158417540 is an apocalyptic number.

2158417540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2158417540 is an abundant number, since it is smaller than the sum of its proper divisors (2385693332).

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

2158417540 is a wasteful number, since it uses less digits than its factorization.

2158417540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272247 (or 272245 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 37.

The square root of 2158417540 is about 46458.7724762504. The cubic root of 2158417540 is about 1292.3450603493.

The spelling of 2158417540 in words is "two billion, one hundred fifty-eight million, four hundred seventeen thousand, five hundred forty".