405011989 has 2 divisors, whose sum is σ = 405011990. Its totient is φ = 405011988.

The previous prime is 405011987. The next prime is 405012031. The reversal of 405011989 is 989110504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 240095025 + 164916964 = 15495^2 + 12842^2 .

It is a cyclic number.

It is not a de Polignac number, because 405011989 - 2¹ = 405011987 is a prime.

It is a super-2 number, since 2×405011989² = 328069422467472242, which contains 22 as substring.

Together with 405011987, 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 (405011983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202505994 + 202505995.

It is an arithmetic number, because the mean of its divisors is an integer number (202505995).

Almost surely, 2^405011989 is an apocalyptic number.

It is an amenable number.

405011989 is a deficient number, since it is larger than the sum of its proper divisors (1).

405011989 is an equidigital number, since it uses as much as digits as its factorization.

405011989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 405011989 is about 20124.9096643935. The cubic root of 405011989 is about 739.8709228238.

The spelling of 405011989 in words is "four hundred five million, eleven thousand, nine hundred eighty-nine".