3121428 has 24 divisors (see below), whose sum is σ = 7312032. Its totient is φ = 1036384.

The previous prime is 3121427. The next prime is 3121429. The reversal of 3121428 is 8241213.

It is an interprime number because it is at equal distance from previous prime (3121427) and next prime (3121429).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5326 + ... + 5882.

It is an arithmetic number, because the mean of its divisors is an integer number (304668).

Almost surely, 2^3121428 is an apocalyptic number.

It is an amenable number.

3121428 is an abundant number, since it is smaller than the sum of its proper divisors (4190604).

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

3121428 is a wasteful number, since it uses less digits than its factorization.

3121428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031 (or 1029 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

The square root of 3121428 is about 1766.7563499249. The cubic root of 3121428 is about 146.1451611857.

The spelling of 3121428 in words is "three million, one hundred twenty-one thousand, four hundred twenty-eight".