404021142 has 64 divisors (see below), whose sum is σ = 1030901760. Its totient is φ = 114892992.

The previous prime is 404021129. The next prime is 404021159. The reversal of 404021142 is 241120404.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 81898 + ... + 86690.

It is an arithmetic number, because the mean of its divisors is an integer number (16107840).

Almost surely, 2^404021142 is an apocalyptic number.

404021142 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 404021142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (515450880).

404021142 is an abundant number, since it is smaller than the sum of its proper divisors (626880618).

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

404021142 is a wasteful number, since it uses less digits than its factorization.

404021142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5034 (or 5028 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 404021142 is about 20100.2771622682. The cubic root of 404021142 is about 739.2670744183.

Adding to 404021142 its reverse (241120404), we get a palindrome (645141546).

The spelling of 404021142 in words is "four hundred four million, twenty-one thousand, one hundred forty-two".