1906129 has 4 divisors (see below), whose sum is σ = 1957684. Its totient is φ = 1854576.

The previous prime is 1906123. The next prime is 1906133. The reversal of 1906129 is 9216091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9216091 = 17 ⋅542123.

It can be written as a sum of positive squares in 2 ways, for example, as 1782225 + 123904 = 1335^2 + 352^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1906129 is a prime.

It is an Ulam number.

It is a pancake number, because a pancake can be divided into 1906129 parts by 1952 straight cuts.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1906097 and 1906106.

It is not an unprimeable number, because it can be changed into a prime (1906123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25722 + ... + 25795.

It is an arithmetic number, because the mean of its divisors is an integer number (489421).

2^1906129 is an apocalyptic number.

It is an amenable number.

1906129 is a deficient number, since it is larger than the sum of its proper divisors (51555).

1906129 is an equidigital number, since it uses as much as digits as its factorization.

1906129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51554.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 1906129 is about 1380.6263071519. The cubic root of 1906129 is about 123.9892680618.

The spelling of 1906129 in words is "one million, nine hundred six thousand, one hundred twenty-nine".