1642690793 has 2 divisors, whose sum is σ = 1642690794. Its totient is φ = 1642690792.

The previous prime is 1642690787. The next prime is 1642690799. The reversal of 1642690793 is 3970962461.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1642690787) and next prime (1642690799).

It can be written as a sum of positive squares in only one way, i.e., 1432092649 + 210598144 = 37843^2 + 14512^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642690793 - 2⁸ = 1642690537 is a prime.

It is a super-3 number, since 3×1642690793³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1642690799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821345396 + 821345397.

It is an arithmetic number, because the mean of its divisors is an integer number (821345397).

Almost surely, 2^1642690793 is an apocalyptic number.

It is an amenable number.

1642690793 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642690793 is an equidigital number, since it uses as much as digits as its factorization.

1642690793 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 1642690793 is about 40530.1220452147. The cubic root of 1642690793 is about 1179.9183111601.

The spelling of 1642690793 in words is "one billion, six hundred forty-two million, six hundred ninety thousand, seven hundred ninety-three".