40400297869 has 2 divisors, whose sum is σ = 40400297870. Its totient is φ = 40400297868.

The previous prime is 40400297867. The next prime is 40400297897. The reversal of 40400297869 is 96879200404.

40400297869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38509352644 + 1890945225 = 196238^2 + 43485^2 .

It is a cyclic number.

It is not a de Polignac number, because 40400297869 - 2¹ = 40400297867 is a prime.

It is a super-2 number, since 2×40400297869² (a number of 22 digits) contains 22 as substring.

Together with 40400297867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40400297867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20200148934 + 20200148935.

It is an arithmetic number, because the mean of its divisors is an integer number (20200148935).

Almost surely, 2^40400297869 is an apocalyptic number.

It is an amenable number.

40400297869 is a deficient number, since it is larger than the sum of its proper divisors (1).

40400297869 is an equidigital number, since it uses as much as digits as its factorization.

40400297869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 40400297869 in words is "forty billion, four hundred million, two hundred ninety-seven thousand, eight hundred sixty-nine".