1409681 has 12 divisors (see below), whose sum is σ = 1766772. Its totient is φ = 1114848.

The previous prime is 1409677. The next prime is 1409713. The reversal of 1409681 is 1869041.

It can be written as a sum of positive squares in 2 ways, for example, as 919681 + 490000 = 959^2 + 700^2 .

It is not a de Polignac number, because 1409681 - 2² = 1409677 is a prime.

It is a super-2 number, since 2×1409681² = 3974401043522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1409651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 470 + ... + 1743.

It is an arithmetic number, because the mean of its divisors is an integer number (147231).

2^1409681 is an apocalyptic number.

It is an amenable number.

1409681 is a deficient number, since it is larger than the sum of its proper divisors (357091).

1409681 is a wasteful number, since it uses less digits than its factorization.

1409681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240 (or 2233 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1409681 is about 1187.2998778742. The cubic root of 1409681 is about 112.1261599199.

The spelling of 1409681 in words is "one million, four hundred nine thousand, six hundred eighty-one".