4021972 has 6 divisors (see below), whose sum is σ = 7038458. Its totient is φ = 2010984.

The previous prime is 4021967. The next prime is 4021973. The reversal of 4021972 is 2791204.

It can be written as a sum of positive squares in only one way, i.e., 3865156 + 156816 = 1966^2 + 396^2 .

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502743 + ... + 502750.

Almost surely, 2^4021972 is an apocalyptic number.

It is an amenable number.

4021972 is a deficient number, since it is larger than the sum of its proper divisors (3016486).

4021972 is a wasteful number, since it uses less digits than its factorization.

4021972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005497 (or 1005495 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 4021972 is about 2005.4854773845. The cubic root of 4021972 is about 159.0302277617.

The spelling of 4021972 in words is "four million, twenty-one thousand, nine hundred seventy-two".