400412440 has 16 divisors (see below), whose sum is σ = 900928080. Its totient is φ = 160164960.

The previous prime is 400412429. The next prime is 400412443. The reversal of 400412440 is 44214004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400412443) 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, 5005116 + ... + 5005195.

It is an arithmetic number, because the mean of its divisors is an integer number (56308005).

Almost surely, 2^400412440 is an apocalyptic number.

400412440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400412440 is an abundant number, since it is smaller than the sum of its proper divisors (500515640).

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

400412440 is a wasteful number, since it uses less digits than its factorization.

400412440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10010322 (or 10010318 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 400412440 is about 20010.3083434514. The cubic root of 400412440 is about 737.0594530644.

Adding to 400412440 its reverse (44214004), we get a palindrome (444626444).

The spelling of 400412440 in words is "four hundred million, four hundred twelve thousand, four hundred forty".