1309642 has 4 divisors (see below), whose sum is σ = 1964466. Its totient is φ = 654820.

The previous prime is 1309639. The next prime is 1309661. The reversal of 1309642 is 2469031.

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., 1297321 + 12321 = 1139^2 + 111^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327409 + ... + 327412.

2^1309642 is an apocalyptic number.

1309642 is a deficient number, since it is larger than the sum of its proper divisors (654824).

1309642 is an equidigital number, since it uses as much as digits as its factorization.

1309642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654823.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1309642 is about 1144.3959105135. The cubic root of 1309642 is about 109.4084498507.

The spelling of 1309642 in words is "one million, three hundred nine thousand, six hundred forty-two".