1642939 has 2 divisors, whose sum is σ = 1642940.
Its totient is φ = 1642938.
The previous prime is 1642919. The next prime is 1642943. The reversal of 1642939 is 9392461.
1642939 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 1642939 - 27 = 1642811 is a prime.
It is not a weakly prime, because it can be changed into another prime (1642909) 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 as a sum of consecutive naturals, namely, 821469 + 821470.
It is an arithmetic number, because the mean of its divisors is an integer number (821470).
21642939 is an apocalyptic number.
1642939 is a deficient number, since it is larger than the sum of its proper divisors (1).
1642939 is an equidigital number, since it uses as much as digits as its factorization.
1642939 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 11664, while the sum is 34.
The square root of 1642939 is about 1281.7718205671.
The cubic root of 1642939 is about 117.9977735863.
The spelling of 1642939 in words is "one million, six hundred forty-two thousand, nine hundred thirty-nine".