1642723429 has 2 divisors, whose sum is σ = 1642723430. Its totient is φ = 1642723428.

The previous prime is 1642723427. The next prime is 1642723501. The reversal of 1642723429 is 9243272461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1204784100 + 437939329 = 34710^2 + 20927^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642723429 - 2¹ = 1642723427 is a prime.

Together with 1642723427, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1642723391 and 1642723400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1642723427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821361714 + 821361715.

It is an arithmetic number, because the mean of its divisors is an integer number (821361715).

Almost surely, 2^1642723429 is an apocalyptic number.

It is an amenable number.

1642723429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642723429 is an equidigital number, since it uses as much as digits as its factorization.

1642723429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 40.

The square root of 1642723429 is about 40530.5246573493. The cubic root of 1642723429 is about 1179.9261250792.

The spelling of 1642723429 in words is "one billion, six hundred forty-two million, seven hundred twenty-three thousand, four hundred twenty-nine".