1801616 has 10 divisors (see below), whose sum is σ = 3490662. Its totient is φ = 900800.

The previous prime is 1801601. The next prime is 1801619. The reversal of 1801616 is 6161081.

It is a happy number.

1801616 is an esthetic number in base 7, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in only one way, i.e., 1638400 + 163216 = 1280^2 + 404^2 .

It is a super-2 number, since 2×1801616² = 6491640422912, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1801591 and 1801600.

It is not an unprimeable number, because it can be changed into a prime (1801619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56285 + ... + 56316.

2^1801616 is an apocalyptic number.

1801616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1801616 is a deficient number, since it is larger than the sum of its proper divisors (1689046).

1801616 is a wasteful number, since it uses less digits than its factorization.

1801616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112609 (or 112603 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1801616 is about 1342.2428990313. The cubic root of 1801616 is about 121.6804321282.

Adding to 1801616 its reverse (6161081), we get a palindrome (7962697).

The spelling of 1801616 in words is "one million, eight hundred one thousand, six hundred sixteen".