1691404 has 24 divisors (see below), whose sum is σ = 3478608. Its totient is φ = 709440.

The previous prime is 1691401. The next prime is 1691411. The reversal of 1691404 is 4041961.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (1691401) 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, 907 + ... + 2050.

It is an arithmetic number, because the mean of its divisors is an integer number (144942).

2^1691404 is an apocalyptic number.

It is an amenable number.

1691404 is an abundant number, since it is smaller than the sum of its proper divisors (1787204).

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

1691404 is a wasteful number, since it uses less digits than its factorization.

1691404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2985 (or 2983 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1691404 is about 1300.5398878927. The cubic root of 1691404 is about 119.1468187612.

The spelling of 1691404 in words is "one million, six hundred ninety-one thousand, four hundred four".