400407840 has 192 divisors, whose sum is σ = 1601752320. Its totient is φ = 91514880.

The previous prime is 400407827. The next prime is 400407841. The reversal of 400407840 is 48704004.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (400407841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23620 + ... + 36860.

It is an arithmetic number, because the mean of its divisors is an integer number (8342460).

Almost surely, 2^400407840 is an apocalyptic number.

400407840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400407840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (800876160).

400407840 is an abundant number, since it is smaller than the sum of its proper divisors (1201344480).

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

400407840 is a wasteful number, since it uses less digits than its factorization.

400407840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13272 (or 13258 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 400407840 is about 20010.1934023637. The cubic root of 400407840 is about 737.0566305693.

The spelling of 400407840 in words is "four hundred million, four hundred seven thousand, eight hundred forty".