405430943881 has 2 divisors, whose sum is σ = 405430943882. Its totient is φ = 405430943880.

The previous prime is 405430943837. The next prime is 405430943891. The reversal of 405430943881 is 188349034504.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 372636993600 + 32793950281 = 610440^2 + 181091^2 .

It is a cyclic number.

It is not a de Polignac number, because 405430943881 - 2²³ = 405422555273 is a prime.

It is a super-2 number, since 2×405430943881² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (405430943821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202715471940 + 202715471941.

It is an arithmetic number, because the mean of its divisors is an integer number (202715471941).

Almost surely, 2^405430943881 is an apocalyptic number.

It is an amenable number.

405430943881 is a deficient number, since it is larger than the sum of its proper divisors (1).

405430943881 is an equidigital number, since it uses as much as digits as its factorization.

405430943881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1658880, while the sum is 49.

The spelling of 405430943881 in words is "four hundred five billion, four hundred thirty million, nine hundred forty-three thousand, eight hundred eighty-one".