1670217405 has 16 divisors (see below), whose sum is σ = 2695999680. Its totient is φ = 882898688.

The previous prime is 1670217397. The next prime is 1670217431. The reversal of 1670217405 is 5047120761.

It is a cyclic number.

It is not a de Polignac number, because 1670217405 - 2³ = 1670217397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 490995 + ... + 494384.

It is an arithmetic number, because the mean of its divisors is an integer number (168499980).

Almost surely, 2^1670217405 is an apocalyptic number.

1670217405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1670217405 is a deficient number, since it is larger than the sum of its proper divisors (1025782275).

1670217405 is a wasteful number, since it uses less digits than its factorization.

1670217405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985500.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 1670217405 is about 40868.2933947578. The cubic root of 1670217405 is about 1186.4724774384.

The spelling of 1670217405 in words is "one billion, six hundred seventy million, two hundred seventeen thousand, four hundred five".