19880129 has 2 divisors, whose sum is σ = 19880130. Its totient is φ = 19880128.

The previous prime is 19880117. The next prime is 19880149. The reversal of 19880129 is 92108891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15249025 + 4631104 = 3905^2 + 2152^2 .

It is a cyclic number.

It is not a de Polignac number, because 19880129 - 2¹⁶ = 19814593 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19880092 and 19880101.

It is not a weakly prime, because it can be changed into another prime (19880149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9940064 + 9940065.

It is an arithmetic number, because the mean of its divisors is an integer number (9940065).

Almost surely, 2^19880129 is an apocalyptic number.

It is an amenable number.

19880129 is a deficient number, since it is larger than the sum of its proper divisors (1).

19880129 is an equidigital number, since it uses as much as digits as its factorization.

19880129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 19880129 is about 4458.7138280002. The cubic root of 19880129 is about 270.8983746800.

The spelling of 19880129 in words is "nineteen million, eight hundred eighty thousand, one hundred twenty-nine".