402781432144 has 80 divisors (see below), whose sum is σ = 991462097920. Its totient is φ = 154202019840.

The previous prime is 402781432127. The next prime is 402781432147. The reversal of 402781432144 is 441234187204.

It is a junction number, because it is equal to n+sod(n) for n = 402781432097 and 402781432106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402781432147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4416729 + ... + 4507000.

It is an arithmetic number, because the mean of its divisors is an integer number (12393276224).

Almost surely, 2^402781432144 is an apocalyptic number.

It is an amenable number.

402781432144 is an abundant number, since it is smaller than the sum of its proper divisors (588680665776).

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

402781432144 is a wasteful number, since it uses less digits than its factorization.

402781432144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8923788 (or 8923782 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 40.

The spelling of 402781432144 in words is "four hundred two billion, seven hundred eighty-one million, four hundred thirty-two thousand, one hundred forty-four".