400204040420 has 24 divisors (see below), whose sum is σ = 844651752000. Its totient is φ = 159277184352.

The previous prime is 400204040399. The next prime is 400204040531. The reversal of 400204040420 is 24040402004.

It is a super-3 number, since 3×400204040420³ (a number of 36 digits) contains 333 as substring.

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 = 400204040392 and 400204040401.

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, 50272910 + ... + 50280869.

It is an arithmetic number, because the mean of its divisors is an integer number (35193823000).

Almost surely, 2^400204040420 is an apocalyptic number.

It is an amenable number.

400204040420 is an abundant number, since it is smaller than the sum of its proper divisors (444447711580).

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

400204040420 is a wasteful number, since it uses less digits than its factorization.

400204040420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100553987 (or 100553985 counting only the distinct ones).

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

Adding to 400204040420 its reverse (24040402004), we get a palindrome (424244442424).

The spelling of 400204040420 in words is "four hundred billion, two hundred four million, forty thousand, four hundred twenty".