400155230020 has 192 divisors, whose sum is σ = 1100922278400. Its totient is φ = 118628167680.

The previous prime is 400155229939. The next prime is 400155230021. The reversal of 400155230020 is 20032551004.

It is a super-2 number, since 2×400155230020² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 400155229973 and 400155230000.

It is not an unprimeable number, because it can be changed into a prime (400155230021) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3012610 + ... + 3142630.

It is an arithmetic number, because the mean of its divisors is an integer number (5733970200).

Almost surely, 2^400155230020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400155230020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (550461139200).

400155230020 is an abundant number, since it is smaller than the sum of its proper divisors (700767048380).

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

400155230020 is a wasteful number, since it uses less digits than its factorization.

400155230020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130158 (or 130156 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

Adding to 400155230020 its reverse (20032551004), we get a palindrome (420187781024).

The spelling of 400155230020 in words is "four hundred billion, one hundred fifty-five million, two hundred thirty thousand, twenty".