2151420 has 48 divisors (see below), whose sum is σ = 6289920. Its totient is φ = 548416.

The previous prime is 2151403. The next prime is 2151421. The reversal of 2151420 is 241512.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2151420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 601 + ... + 2159.

It is an arithmetic number, because the mean of its divisors is an integer number (131040).

2^2151420 is an apocalyptic number.

2151420 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 2151420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3144960).

2151420 is an abundant number, since it is smaller than the sum of its proper divisors (4138500).

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

2151420 is a wasteful number, since it uses less digits than its factorization.

2151420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594 (or 1592 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 2151420 is about 1466.7719659170. The cubic root of 2151420 is about 129.0946964077.

Adding to 2151420 its reverse (241512), we get a palindrome (2392932).

The spelling of 2151420 in words is "two million, one hundred fifty-one thousand, four hundred twenty".