1691456 has 56 divisors (see below), whose sum is σ = 3840480. Its totient is φ = 732672.

The previous prime is 1691441. The next prime is 1691461. The reversal of 1691456 is 6541961.

It is a super-2 number, since 2×1691456² = 5722046799872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15755 + ... + 15861.

It is an arithmetic number, because the mean of its divisors is an integer number (68580).

2^1691456 is an apocalyptic number.

1691456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1691456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1920240).

1691456 is an abundant number, since it is smaller than the sum of its proper divisors (2149024).

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

1691456 is a wasteful number, since it uses less digits than its factorization.

1691456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 141 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 1691456 is about 1300.5598794365. The cubic root of 1691456 is about 119.1480397530.

The spelling of 1691456 in words is "one million, six hundred ninety-one thousand, four hundred fifty-six".