1881629 has 4 divisors (see below), whose sum is σ = 1884480. Its totient is φ = 1878780.

The previous prime is 1881619. The next prime is 1881631. The reversal of 1881629 is 9261881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9261881 = 79 ⋅117239.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1881629 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134 + ... + 1944.

It is an arithmetic number, because the mean of its divisors is an integer number (471120).

2^1881629 is an apocalyptic number.

It is an amenable number.

1881629 is a deficient number, since it is larger than the sum of its proper divisors (2851).

1881629 is a wasteful number, since it uses less digits than its factorization.

1881629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2850.

The product of its digits is 6912, while the sum is 35.

The square root of 1881629 is about 1371.7248266325. The cubic root of 1881629 is about 123.4557529703.

The spelling of 1881629 in words is "one million, eight hundred eighty-one thousand, six hundred twenty-nine".