1292861 has 4 divisors (see below), whose sum is σ = 1295424. Its totient is φ = 1290300.

The previous prime is 1292857. The next prime is 1292887. The reversal of 1292861 is 1682921.

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 an emirpimes, since its reverse is a distinct semiprime: 1682921 = 229 ⋅7349.

It is a cyclic number.

It is not a de Polignac number, because 1292861 - 2² = 1292857 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1292801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245 + ... + 1626.

It is an arithmetic number, because the mean of its divisors is an integer number (323856).

2^1292861 is an apocalyptic number.

1292861 is the 509-th centered decagonal number.

It is an amenable number.

1292861 is a deficient number, since it is larger than the sum of its proper divisors (2563).

1292861 is an equidigital number, since it uses as much as digits as its factorization.

1292861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562.

The product of its digits is 1728, while the sum is 29.

The square root of 1292861 is about 1137.0404566241. The cubic root of 1292861 is about 108.9391406184.

The spelling of 1292861 in words is "one million, two hundred ninety-two thousand, eight hundred sixty-one".