2151380 has 72 divisors (see below), whose sum is σ = 5720064. Its totient is φ = 665280.

The previous prime is 2151377. The next prime is 2151403. The reversal of 2151380 is 831512.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16877 + ... + 17003.

2^2151380 is an apocalyptic number.

2151380 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 2151380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2860032).

2151380 is an abundant number, since it is smaller than the sum of its proper divisors (3568684).

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

2151380 is a wasteful number, since it uses less digits than its factorization.

2151380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 2151380 is about 1466.7583304689. The cubic root of 2151380 is about 129.0938963439.

Adding to 2151380 its reverse (831512), we get a palindrome (2982892).

The spelling of 2151380 in words is "two million, one hundred fifty-one thousand, three hundred eighty".