400155613606420 has 192 divisors, whose sum is σ = 1022265566945280. Its totient is φ = 128440289894400.

The previous prime is 400155613606393. The next prime is 400155613606453. The reversal of 400155613606420 is 24606316551004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8701092786 + ... + 8701138774.

It is an arithmetic number, because the mean of its divisors is an integer number (5324299827840).

Almost surely, 2^{400155613606420} 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 400155613606420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (511132783472640).

400155613606420 is an abundant number, since it is smaller than the sum of its proper divisors (622109953338860).

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

400155613606420 is a wasteful number, since it uses less digits than its factorization.

400155613606420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65354 (or 65352 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 400155613606420 in words is "four hundred trillion, one hundred fifty-five billion, six hundred thirteen million, six hundred six thousand, four hundred twenty".