2158987326 has 16 divisors (see below), whose sum is σ = 4359897984. Its totient is φ = 712675224.

The previous prime is 2158987291. The next prime is 2158987339. The reversal of 2158987326 is 6237898512.

It is a super-2 number, since 2×2158987326² = 9322452547657260552, which contains 22 as substring.

It is a congruent number.

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, 1746136 + ... + 1747371.

It is an arithmetic number, because the mean of its divisors is an integer number (272493624).

Almost surely, 2^2158987326 is an apocalyptic number.

2158987326 is an abundant number, since it is smaller than the sum of its proper divisors (2200910658).

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

2158987326 is a wasteful number, since it uses less digits than its factorization.

2158987326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3493615.

The product of its digits is 1451520, while the sum is 51.

The square root of 2158987326 is about 46464.9042396517. The cubic root of 2158987326 is about 1292.4587694784.

The spelling of 2158987326 in words is "two billion, one hundred fifty-eight million, nine hundred eighty-seven thousand, three hundred twenty-six".