2155240500 has 384 divisors, whose sum is σ = 7547904000. Its totient is φ = 477456000.

The previous prime is 2155240489. The next prime is 2155240511. The reversal of 2155240500 is 50425512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2155240489) and next prime (2155240511).

It is a super-2 number, since 2×2155240500² = 9290123225680500000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 30355465 + ... + 30355535.

It is an arithmetic number, because the mean of its divisors is an integer number (19656000).

Almost surely, 2^2155240500 is an apocalyptic number.

2155240500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155240500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3773952000).

2155240500 is an abundant number, since it is smaller than the sum of its proper divisors (5392663500).

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

2155240500 is a wasteful number, since it uses less digits than its factorization.

2155240500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 2155240500 is about 46424.5678493618. The cubic root of 2155240500 is about 1291.7106684051.

The spelling of 2155240500 in words is "two billion, one hundred fifty-five million, two hundred forty thousand, five hundred".