400402004420 has 24 divisors (see below), whose sum is σ = 917284592448. Its totient is φ = 145600728800.

The previous prime is 400402004419. The next prime is 400402004447. The reversal of 400402004420 is 24400204004.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 400402004392 and 400402004401.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 910004336 + ... + 910004775.

It is an arithmetic number, because the mean of its divisors is an integer number (38220191352).

Almost surely, 2^400402004420 is an apocalyptic number.

It is an amenable number.

400402004420 is an abundant number, since it is smaller than the sum of its proper divisors (516882588028).

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

400402004420 is a wasteful number, since it uses less digits than its factorization.

400402004420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820009131 (or 1820009129 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

Adding to 400402004420 its reverse (24400204004), we get a palindrome (424802208424).

The spelling of 400402004420 in words is "four hundred billion, four hundred two million, four thousand, four hundred twenty".