400134835861 has 2 divisors, whose sum is σ = 400134835862. Its totient is φ = 400134835860.

The previous prime is 400134835829. The next prime is 400134835883. The reversal of 400134835861 is 168538431004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 232193878225 + 167940957636 = 481865^2 + 409806^2 .

It is a cyclic number.

It is not a de Polignac number, because 400134835861 - 2⁵ = 400134835829 is a prime.

It is a super-2 number, since 2×400134835861² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400134839861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200067417930 + 200067417931.

It is an arithmetic number, because the mean of its divisors is an integer number (200067417931).

Almost surely, 2^400134835861 is an apocalyptic number.

It is an amenable number.

400134835861 is a deficient number, since it is larger than the sum of its proper divisors (1).

400134835861 is an equidigital number, since it uses as much as digits as its factorization.

400134835861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 276480, while the sum is 43.

The spelling of 400134835861 in words is "four hundred billion, one hundred thirty-four million, eight hundred thirty-five thousand, eight hundred sixty-one".