400018019652 has 72 divisors (see below), whose sum is σ = 1023954003072. Its totient is φ = 131658984000.

The previous prime is 400018019651. The next prime is 400018019669. The reversal of 400018019652 is 256910810004.

400018019652 is a `hidden beast` number, since 400 + 0 + 18 + 0 + 196 + 52 = 666.

It is a super-2 number, since 2×400018019652² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (400018019651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1184527 + ... + 1484297.

It is an arithmetic number, because the mean of its divisors is an integer number (14221583376).

Almost surely, 2^400018019652 is an apocalyptic number.

It is an amenable number.

400018019652 is an abundant number, since it is smaller than the sum of its proper divisors (623935983420).

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

400018019652 is a wasteful number, since it uses less digits than its factorization.

400018019652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300249 (or 300244 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

Adding to 400018019652 its reverse (256910810004), we get a palindrome (656928829656).

The spelling of 400018019652 in words is "four hundred billion, eighteen million, nineteen thousand, six hundred fifty-two".