402440231420 has 12 divisors (see below), whose sum is σ = 845124486024. Its totient is φ = 160976092560.

The previous prime is 402440231399. The next prime is 402440231429. The reversal of 402440231420 is 24132044204.

It is a happy number.

It is a super-3 number, since 3×402440231420³ (a number of 36 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 402440231420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402440231429) 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, 10061005766 + ... + 10061005805.

It is an arithmetic number, because the mean of its divisors is an integer number (70427040502).

Almost surely, 2^402440231420 is an apocalyptic number.

It is an amenable number.

402440231420 is an abundant number, since it is smaller than the sum of its proper divisors (442684254604).

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

402440231420 is a wasteful number, since it uses less digits than its factorization.

402440231420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20122011580 (or 20122011578 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 402440231420 its reverse (24132044204), we get a palindrome (426572275624).

The spelling of 402440231420 in words is "four hundred two billion, four hundred forty million, two hundred thirty-one thousand, four hundred twenty".