1691340 has 48 divisors (see below), whose sum is σ = 5413632. Its totient is φ = 386496.

The previous prime is 1691321. The next prime is 1691359. The reversal of 1691340 is 431961.

It is an interprime number because it is at equal distance from previous prime (1691321) and next prime (1691359).

It is a self number, because there is not a number n which added to its sum of digits gives 1691340.

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, 1594 + ... + 2433.

It is an arithmetic number, because the mean of its divisors is an integer number (112784).

2^1691340 is an apocalyptic number.

1691340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1691340 is an abundant number, since it is smaller than the sum of its proper divisors (3722292).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1691340 is a wasteful number, since it uses less digits than its factorization.

1691340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4046 (or 4044 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 1691340 is about 1300.5152824938. The cubic root of 1691340 is about 119.1453159678.

The spelling of 1691340 in words is "one million, six hundred ninety-one thousand, three hundred forty".