1292206642 has 4 divisors (see below), whose sum is σ = 1938309966. Its totient is φ = 646103320.

The previous prime is 1292206637. The next prime is 1292206667. The reversal of 1292206642 is 2466022921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 677612961 + 614593681 = 26031^2 + 24791^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1292206598 and 1292206607.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 323051659 + ... + 323051662.

Almost surely, 2^1292206642 is an apocalyptic number.

1292206642 is a deficient number, since it is larger than the sum of its proper divisors (646103324).

1292206642 is an equidigital number, since it uses as much as digits as its factorization.

1292206642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646103323.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 1292206642 is about 35947.2758634086. The cubic root of 1292206642 is about 1089.2075833082.

The spelling of 1292206642 in words is "one billion, two hundred ninety-two million, two hundred six thousand, six hundred forty-two".