1623834409 has 2 divisors, whose sum is σ = 1623834410. Its totient is φ = 1623834408.

The previous prime is 1623834389. The next prime is 1623834427. The reversal of 1623834409 is 9044383261.

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., 1336633600 + 287200809 = 36560^2 + 16947^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1623834409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1623837409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811917204 + 811917205.

It is an arithmetic number, because the mean of its divisors is an integer number (811917205).

Almost surely, 2^1623834409 is an apocalyptic number.

It is an amenable number.

1623834409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1623834409 is an equidigital number, since it uses as much as digits as its factorization.

1623834409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 1623834409 is about 40296.8287710088. The cubic root of 1623834409 is about 1175.3861797476.

The spelling of 1623834409 in words is "one billion, six hundred twenty-three million, eight hundred thirty-four thousand, four hundred nine".