1616421 has 8 divisors (see below), whose sum is σ = 2164320. Its totient is φ = 1073072.

The previous prime is 1616401. The next prime is 1616429. The reversal of 1616421 is 1246161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1616421 - 2¹⁴ = 1600037 is a prime.

It is a super-2 number, since 2×1616421² = 5225633698482, which contains 22 as substring.

1616421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195 + ... + 1808.

It is an arithmetic number, because the mean of its divisors is an integer number (270540).

2^1616421 is an apocalyptic number.

It is an amenable number.

1616421 is a deficient number, since it is larger than the sum of its proper divisors (547899).

1616421 is a wasteful number, since it uses less digits than its factorization.

1616421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2275.

The product of its digits is 288, while the sum is 21.

The square root of 1616421 is about 1271.3854647588. The cubic root of 1616421 is about 117.3594758883.

The spelling of 1616421 in words is "one million, six hundred sixteen thousand, four hundred twenty-one".