1691379 has 6 divisors (see below), whose sum is σ = 2443116. Its totient is φ = 1127580.

The previous prime is 1691369. The next prime is 1691387. The reversal of 1691379 is 9731961.

It is not a de Polignac number, because 1691379 - 2¹⁵ = 1658611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1691359) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 93957 + ... + 93974.

It is an arithmetic number, because the mean of its divisors is an integer number (407186).

2^1691379 is an apocalyptic number.

1691379 is a deficient number, since it is larger than the sum of its proper divisors (751737).

1691379 is a wasteful number, since it uses less digits than its factorization.

1691379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187937 (or 187934 counting only the distinct ones).

The product of its digits is 10206, while the sum is 36.

The square root of 1691379 is about 1300.5302764642. The cubic root of 1691379 is about 119.1462317370.

The spelling of 1691379 in words is "one million, six hundred ninety-one thousand, three hundred seventy-nine".