400001269 has 2 divisors, whose sum is σ = 400001270. Its totient is φ = 400001268.

The previous prime is 400001267. The next prime is 400001341. The reversal of 400001269 is 962100004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 327972100 + 72029169 = 18110^2 + 8487^2 .

It is a cyclic number.

It is not a de Polignac number, because 400001269 - 2¹ = 400001267 is a prime.

It is a super-2 number, since 2×400001269² = 320002030403220722, which contains 22 as substring.

Together with 400001267, 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 (400001267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200000634 + 200000635.

It is an arithmetic number, because the mean of its divisors is an integer number (200000635).

Almost surely, 2^400001269 is an apocalyptic number.

It is an amenable number.

400001269 is a deficient number, since it is larger than the sum of its proper divisors (1).

400001269 is an equidigital number, since it uses as much as digits as its factorization.

400001269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 400001269 is about 20000.0317249748. The cubic root of 400001269 is about 736.8070788999.

The spelling of 400001269 in words is "four hundred million, one thousand, two hundred sixty-nine".