400000520135 has 32 divisors (see below), whose sum is σ = 501780787200. Its totient is φ = 305766489600.

The previous prime is 400000520119. The next prime is 400000520141. The reversal of 400000520135 is 531025000004.

It is not a de Polignac number, because 400000520135 - 2⁴ = 400000520119 is a prime.

It is a super-2 number, since 2×400000520135² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3991199 + ... + 4090191.

It is an arithmetic number, because the mean of its divisors is an integer number (15680649600).

Almost surely, 2^400000520135 is an apocalyptic number.

400000520135 is a deficient number, since it is larger than the sum of its proper divisors (101780267065).

400000520135 is a wasteful number, since it uses less digits than its factorization.

400000520135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99359.

The product of its (nonzero) digits is 600, while the sum is 20.

Adding to 400000520135 its reverse (531025000004), we get a palindrome (931025520139).

The spelling of 400000520135 in words is "four hundred billion, five hundred twenty thousand, one hundred thirty-five".