400022520 has 128 divisors (see below), whose sum is σ = 1259712000. Its totient is φ = 101480960.

The previous prime is 400022477. The next prime is 400022521. The reversal of 400022520 is 25220004.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 400022520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400022521) 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, 246271 + ... + 247889.

It is an arithmetic number, because the mean of its divisors is an integer number (9841500).

Almost surely, 2^400022520 is an apocalyptic number.

400022520 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 400022520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (629856000).

400022520 is an abundant number, since it is smaller than the sum of its proper divisors (859689480).

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

400022520 is a wasteful number, since it uses less digits than its factorization.

400022520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1733 (or 1729 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 400022520 is about 20000.5629920760. The cubic root of 400022520 is about 736.8201268668.

Adding to 400022520 its reverse (25220004), we get a palindrome (425242524).

The spelling of 400022520 in words is "four hundred million, twenty-two thousand, five hundred twenty".