402042242440 has 16 divisors (see below), whose sum is σ = 904595045580. Its totient is φ = 160816896960.

The previous prime is 402042242423. The next prime is 402042242449. The reversal of 402042242440 is 44242240204.

It can be written as a sum of positive squares in 2 ways, for example, as 390282575076 + 11759667364 = 624726^2 + 108442^2 .

It is a junction number, because it is equal to n+sod(n) for n = 402042242399 and 402042242408.

It is not an unprimeable number, because it can be changed into a prime (402042242449) 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, 5025527991 + ... + 5025528070.

Almost surely, 2^402042242440 is an apocalyptic number.

402042242440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402042242440 is an abundant number, since it is smaller than the sum of its proper divisors (502552803140).

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

402042242440 is a wasteful number, since it uses less digits than its factorization.

402042242440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10051056072 (or 10051056068 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 28.

Adding to 402042242440 its reverse (44242240204), we get a palindrome (446284482644).

The spelling of 402042242440 in words is "four hundred two billion, forty-two million, two hundred forty-two thousand, four hundred forty".