1697420309 has 32 divisors (see below), whose sum is σ = 2035864320. Its totient is φ = 1400053248.

The previous prime is 1697420299. The next prime is 1697420321. The reversal of 1697420309 is 9030247961.

It is a cyclic number.

It is not a de Polignac number, because 1697420309 - 2⁴ = 1697420293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1697420509) 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 31 ways as a sum of consecutive naturals, for example, 412667 + ... + 416759.

It is an arithmetic number, because the mean of its divisors is an integer number (63620760).

Almost surely, 2^1697420309 is an apocalyptic number.

1697420309 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1697420309 is a deficient number, since it is larger than the sum of its proper divisors (338444011).

1697420309 is a wasteful number, since it uses less digits than its factorization.

1697420309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4221.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 1697420309 is about 41199.7610308604. The cubic root of 1697420309 is about 1192.8791965359.

The spelling of 1697420309 in words is "one billion, six hundred ninety-seven million, four hundred twenty thousand, three hundred nine".