400867440 has 40 divisors (see below), whose sum is σ = 1242689808. Its totient is φ = 106897920.

The previous prime is 400867433. The next prime is 400867459. The reversal of 400867440 is 44768004.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 834901 + ... + 835380.

Almost surely, 2^400867440 is an apocalyptic number.

400867440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400867440 is an abundant number, since it is smaller than the sum of its proper divisors (841822368).

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

400867440 is a wasteful number, since it uses less digits than its factorization.

400867440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670297 (or 1670291 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 400867440 is about 20021.6742556660. The cubic root of 400867440 is about 737.3385278971.

The spelling of 400867440 in words is "four hundred million, eight hundred sixty-seven thousand, four hundred forty".