331421240 has 16 divisors (see below), whose sum is σ = 745697880. Its totient is φ = 132568480.

The previous prime is 331421227. The next prime is 331421249. The reversal of 331421240 is 42124133.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331421249) 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, 4142726 + ... + 4142805.

Almost surely, 2^331421240 is an apocalyptic number.

It is an amenable number.

331421240 is an abundant number, since it is smaller than the sum of its proper divisors (414276640).

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

331421240 is a wasteful number, since it uses less digits than its factorization.

331421240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8285542 (or 8285538 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 331421240 is about 18204.9784399762. The cubic root of 331421240 is about 692.0329597720.

Adding to 331421240 its reverse (42124133), we get a palindrome (373545373).

The spelling of 331421240 in words is "three hundred thirty-one million, four hundred twenty-one thousand, two hundred forty".