400889544 has 32 divisors (see below), whose sum is σ = 1093335840. Its totient is φ = 121481600.

The previous prime is 400889539. The next prime is 400889549. The reversal of 400889544 is 445988004.

It is an interprime number because it is at equal distance from previous prime (400889539) and next prime (400889549).

It is a junction number, because it is equal to n+sod(n) for n = 400889496 and 400889505.

It is not an unprimeable number, because it can be changed into a prime (400889549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 758997 + ... + 759524.

It is an arithmetic number, because the mean of its divisors is an integer number (34166745).

Almost surely, 2^400889544 is an apocalyptic number.

400889544 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

400889544 is an abundant number, since it is smaller than the sum of its proper divisors (692446296).

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

400889544 is a wasteful number, since it uses less digits than its factorization.

400889544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518541 (or 1518537 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

The square root of 400889544 is about 20022.2262498454. The cubic root of 400889544 is about 737.3520800340.

The spelling of 400889544 in words is "four hundred million, eight hundred eighty-nine thousand, five hundred forty-four".