3921972 has 12 divisors (see below), whose sum is σ = 9151296.
Its totient is φ = 1307320.
The previous prime is 3921971. The next prime is 3921991. The reversal of 3921972 is 2791293.
It is a tau number, because it is divible by the number of its divisors (12).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (3921971) 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, 163404 + ... + 163427.
It is an arithmetic number, because the mean of its divisors is an integer number (762608).
Almost surely, 23921972 is an apocalyptic number.
It is an amenable number.
3921972 is an abundant number, since it is smaller than the sum of its proper divisors (5229324).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
3921972 is a wasteful number, since it uses less digits than its factorization.
3921972 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 326838 (or 326836 counting only the distinct ones).
The product of its digits is 6804, while the sum is 33.
The square root of 3921972 is about 1980.3969299108.
The cubic root of 3921972 is about 157.7011388395.
The spelling of 3921972 in words is "three million, nine hundred twenty-one thousand, nine hundred seventy-two".