400020355 has 8 divisors (see below), whose sum is σ = 548599392. Its totient is φ = 274299648.

The previous prime is 400020343. The next prime is 400020359. The reversal of 400020355 is 553020004.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 400020355 - 2⁵ = 400020323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400020359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5714542 + ... + 5714611.

It is an arithmetic number, because the mean of its divisors is an integer number (68574924).

Almost surely, 2^400020355 is an apocalyptic number.

400020355 is a deficient number, since it is larger than the sum of its proper divisors (148579037).

400020355 is a wasteful number, since it uses less digits than its factorization.

400020355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11429165.

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 400020355 is about 20000.5088685263. The cubic root of 400020355 is about 736.8187975929.

Adding to 400020355 its reverse (553020004), we get a palindrome (953040359).

It can be divided in two parts, 40002035 and 5, that added together give a triangular number (40002040 = T₈₉₄₄).

The spelling of 400020355 in words is "four hundred million, twenty thousand, three hundred fifty-five".