4021572 has 12 divisors (see below), whose sum is σ = 9383696. Its totient is φ = 1340520.

The previous prime is 4021561. The next prime is 4021579. The reversal of 4021572 is 2751204.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (4021579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167554 + ... + 167577.

Almost surely, 2^4021572 is an apocalyptic number.

It is an amenable number.

4021572 is an abundant number, since it is smaller than the sum of its proper divisors (5362124).

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

4021572 is a wasteful number, since it uses less digits than its factorization.

4021572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335138 (or 335136 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 4021572 is about 2005.3857484285. The cubic root of 4021572 is about 159.0249555387.

Adding to 4021572 its reverse (2751204), we get a palindrome (6772776).

It can be divided in two parts, 40 and 21572, that added together give a palindrome (21612).

The spelling of 4021572 in words is "four million, twenty-one thousand, five hundred seventy-two".