400178040 has 128 divisors (see below), whose sum is σ = 1239840000. Its totient is φ = 103265280.

The previous prime is 400178029. The next prime is 400178063. The reversal of 400178040 is 40871004.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 400178040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 801711 + ... + 802209.

It is an arithmetic number, because the mean of its divisors is an integer number (9686250).

Almost surely, 2^400178040 is an apocalyptic number.

400178040 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 400178040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (619920000).

400178040 is an abundant number, since it is smaller than the sum of its proper divisors (839661960).

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

400178040 is a wasteful number, since it uses less digits than its factorization.

400178040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717 (or 713 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 400178040 is about 20004.4505048252. The cubic root of 400178040 is about 736.9156010077.

The spelling of 400178040 in words is "four hundred million, one hundred seventy-eight thousand, forty".