4051620 has 120 divisors (see below), whose sum is σ = 13233528. Its totient is φ = 1036800.

The previous prime is 4051613. The next prime is 4051631. The reversal of 4051620 is 261504.

It is a happy number.

4051620 is a `hidden beast` number, since 40 + 5 + 1 + 620 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 272484 + 3779136 = 522^2 + 1944^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 4051593 and 4051602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 66390 + ... + 66450.

Almost surely, 2^4051620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4051620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6616764).

4051620 is an abundant number, since it is smaller than the sum of its proper divisors (9181908).

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

4051620 is a wasteful number, since it uses less digits than its factorization.

4051620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 4051620 is about 2012.8636317446. The cubic root of 4051620 is about 159.4200357156.

It can be divided in two parts, 405 and 1620, that multiplied together give a square (656100 = 810²).

The spelling of 4051620 in words is "four million, fifty-one thousand, six hundred twenty".