1681402 has 12 divisors (see below), whose sum is σ = 2680110. Its totient is φ = 790976.

The previous prime is 1681397. The next prime is 1681403. The reversal of 1681402 is 2041861.

It can be written as a sum of positive squares in 3 ways, for example, as 1661521 + 19881 = 1289^2 + 141^2 .

It is a super-2 number, since 2×1681402² = 5654225371208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1681403) 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, 877 + ... + 2032.

2^1681402 is an apocalyptic number.

1681402 is a deficient number, since it is larger than the sum of its proper divisors (998708).

1681402 is a wasteful number, since it uses less digits than its factorization.

1681402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2945 (or 2928 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1681402 is about 1296.6888601357. The cubic root of 1681402 is about 118.9114988232.

It can be divided in two parts, 16 and 81402, that added together give a palindrome (81418).

The spelling of 1681402 in words is "one million, six hundred eighty-one thousand, four hundred two".