400873578 has 64 divisors (see below), whose sum is σ = 971937792. Its totient is φ = 107743680.

The previous prime is 400873573. The next prime is 400873607. The reversal of 400873578 is 875378004.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (400873573) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55525 + ... + 62327.

It is an arithmetic number, because the mean of its divisors is an integer number (15186528).

Almost surely, 2^400873578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400873578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (485968896).

400873578 is an abundant number, since it is smaller than the sum of its proper divisors (571064214).

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

400873578 is a wasteful number, since it uses less digits than its factorization.

400873578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6899.

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 400873578 is about 20021.8275389636. The cubic root of 400873578 is about 737.3422912034.

The spelling of 400873578 in words is "four hundred million, eight hundred seventy-three thousand, five hundred seventy-eight".