19402143623 has 2 divisors, whose sum is σ = 19402143624. Its totient is φ = 19402143622.

The previous prime is 19402143619. The next prime is 19402143637. The reversal of 19402143623 is 32634120491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19402143623 - 2² = 19402143619 is a prime.

It is a super-2 number, since 2×19402143623² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19402143223) 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, 9701071811 + 9701071812.

It is an arithmetic number, because the mean of its divisors is an integer number (9701071812).

Almost surely, 2^19402143623 is an apocalyptic number.

19402143623 is a deficient number, since it is larger than the sum of its proper divisors (1).

19402143623 is an equidigital number, since it uses as much as digits as its factorization.

19402143623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 19402143623 in words is "nineteen billion, four hundred two million, one hundred forty-three thousand, six hundred twenty-three".