381629 has 2 divisors, whose sum is σ = 381630. Its totient is φ = 381628.

The previous prime is 381607. The next prime is 381631. The reversal of 381629 is 926183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 357604 + 24025 = 598^2 + 155^2 .

It is an emirp because it is prime and its reverse (926183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381629 - 2⁸ = 381373 is a prime.

Together with 381631, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190814 + 190815.

It is an arithmetic number, because the mean of its divisors is an integer number (190815).

2³⁸¹⁶²⁹ is an apocalyptic number.

It is an amenable number.

381629 is a deficient number, since it is larger than the sum of its proper divisors (1).

381629 is an equidigital number, since it uses as much as digits as its factorization.

381629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 381629 is about 617.7612807550. The cubic root of 381629 is about 72.5349177817.

The spelling of 381629 in words is "three hundred eighty-one thousand, six hundred twenty-nine".