400071440009 has 2 divisors, whose sum is σ = 400071440010. Its totient is φ = 400071440008.

The previous prime is 400071439981. The next prime is 400071440149. The reversal of 400071440009 is 900044170004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 373042435984 + 27029004025 = 610772^2 + 164405^2 .

It is a cyclic number.

It is not a de Polignac number, because 400071440009 - 2²⁸ = 399803004553 is a prime.

It is a super-2 number, since 2×400071440009² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400071449009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200035720004 + 200035720005.

It is an arithmetic number, because the mean of its divisors is an integer number (200035720005).

Almost surely, 2^400071440009 is an apocalyptic number.

It is an amenable number.

400071440009 is a deficient number, since it is larger than the sum of its proper divisors (1).

400071440009 is an equidigital number, since it uses as much as digits as its factorization.

400071440009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The spelling of 400071440009 in words is "four hundred billion, seventy-one million, four hundred forty thousand, nine".