1645707397 has 8 divisors (see below), whose sum is σ = 1696147200. Its totient is φ = 1595910384.

The previous prime is 1645707377. The next prime is 1645707407. The reversal of 1645707397 is 7937075461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1645707397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1645707397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645707347) 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 in 7 ways as a sum of consecutive naturals, for example, 155497 + ... + 165742.

It is an arithmetic number, because the mean of its divisors is an integer number (212018400).

Almost surely, 2^1645707397 is an apocalyptic number.

It is an amenable number.

1645707397 is a deficient number, since it is larger than the sum of its proper divisors (50439803).

1645707397 is a wasteful number, since it uses less digits than its factorization.

1645707397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321395.

The product of its (nonzero) digits is 1111320, while the sum is 49.

The square root of 1645707397 is about 40567.3193223314. The cubic root of 1645707397 is about 1180.6401288351.

The spelling of 1645707397 in words is "one billion, six hundred forty-five million, seven hundred seven thousand, three hundred ninety-seven".