1200402409 has 2 divisors, whose sum is σ = 1200402410. Its totient is φ = 1200402408.

The previous prime is 1200402383. The next prime is 1200402449. The reversal of 1200402409 is 9042040021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1160901184 + 39501225 = 34072^2 + 6285^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200402409 - 2¹⁵ = 1200369641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1200402409.

It is not a weakly prime, because it can be changed into another prime (1200402449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600201204 + 600201205.

It is an arithmetic number, because the mean of its divisors is an integer number (600201205).

Almost surely, 2^1200402409 is an apocalyptic number.

It is an amenable number.

1200402409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200402409 is an equidigital number, since it uses as much as digits as its factorization.

1200402409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1200402409 is about 34646.8239381332. The cubic root of 1200402409 is about 1062.7773401774. Note that the first 3 decimals are identical.

The spelling of 1200402409 in words is "one billion, two hundred million, four hundred two thousand, four hundred nine".