3121240 has 16 divisors (see below), whose sum is σ = 7022880.
Its totient is φ = 1248480.
The previous prime is 3121229. The next prime is 3121249. The reversal of 3121240 is 421213.
It is a self number, because there is not a number n which added to its sum of digits gives 3121240.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (3121249) 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, 38976 + ... + 39055.
It is an arithmetic number, because the mean of its divisors is an integer number (438930).
Almost surely, 23121240 is an apocalyptic number.
It is an amenable number.
3121240 is an abundant number, since it is smaller than the sum of its proper divisors (3901640).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
3121240 is a wasteful number, since it uses less digits than its factorization.
3121240 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 78042 (or 78038 counting only the distinct ones).
The product of its (nonzero) digits is 48, while the sum is 13.
The square root of 3121240 is about 1766.7031442775.
The cubic root of 3121240 is about 146.1422270755.
Adding to 3121240 its reverse (421213), we get a palindrome (3542453).
The spelling of 3121240 in words is "three million, one hundred twenty-one thousand, two hundred forty".