405140069 has 2 divisors, whose sum is σ = 405140070. Its totient is φ = 405140068.

The previous prime is 405140053. The next prime is 405140119. The reversal of 405140069 is 960041504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 319336900 + 85803169 = 17870^2 + 9263^2 .

It is a cyclic number.

It is not a de Polignac number, because 405140069 - 2⁴ = 405140053 is a prime.

It is a super-2 number, since 2×405140069² = 328276951018649522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405130069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202570034 + 202570035.

It is an arithmetic number, because the mean of its divisors is an integer number (202570035).

Almost surely, 2^405140069 is an apocalyptic number.

It is an amenable number.

405140069 is a deficient number, since it is larger than the sum of its proper divisors (1).

405140069 is an equidigital number, since it uses as much as digits as its factorization.

405140069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 405140069 is about 20128.0915389413. The cubic root of 405140069 is about 739.9489062605.

The spelling of 405140069 in words is "four hundred five million, one hundred forty thousand, sixty-nine".