1642632389 has 2 divisors, whose sum is σ = 1642632390. Its totient is φ = 1642632388.

The previous prime is 1642632359. The next prime is 1642632491. The reversal of 1642632389 is 9832362461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1618050625 + 24581764 = 40225^2 + 4958^2 .

It is an emirp because it is prime and its reverse (9832362461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1642632389 - 2⁸ = 1642632133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1642632319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821316194 + 821316195.

It is an arithmetic number, because the mean of its divisors is an integer number (821316195).

Almost surely, 2^1642632389 is an apocalyptic number.

It is an amenable number.

1642632389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642632389 is an equidigital number, since it uses as much as digits as its factorization.

1642632389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 44.

The square root of 1642632389 is about 40529.4015376492. The cubic root of 1642632389 is about 1179.9043274438.

The spelling of 1642632389 in words is "one billion, six hundred forty-two million, six hundred thirty-two thousand, three hundred eighty-nine".