405444140 has 12 divisors (see below), whose sum is σ = 851432736. Its totient is φ = 162177648.

The previous prime is 405444107. The next prime is 405444167. The reversal of 405444140 is 41444504.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10136084 + ... + 10136123.

It is an arithmetic number, because the mean of its divisors is an integer number (70952728).

Almost surely, 2^405444140 is an apocalyptic number.

It is an amenable number.

405444140 is an abundant number, since it is smaller than the sum of its proper divisors (445988596).

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

405444140 is a wasteful number, since it uses less digits than its factorization.

405444140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20272216 (or 20272214 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 26.

The square root of 405444140 is about 20135.6435208811. The cubic root of 405444140 is about 740.1339786632.

Adding to 405444140 its reverse (41444504), we get a palindrome (446888644).

The spelling of 405444140 in words is "four hundred five million, four hundred forty-four thousand, one hundred forty".