1620418 has 4 divisors (see below), whose sum is σ = 2430630. Its totient is φ = 810208.

The previous prime is 1620413. The next prime is 1620431. The reversal of 1620418 is 8140261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1605289 + 15129 = 1267^2 + 123^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1620413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405103 + ... + 405106.

2^1620418 is an apocalyptic number.

1620418 is a deficient number, since it is larger than the sum of its proper divisors (810212).

1620418 is an equidigital number, since it uses as much as digits as its factorization.

1620418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810211.

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

The square root of 1620418 is about 1272.9564014529. The cubic root of 1620418 is about 117.4561296915.

Adding to 1620418 its reverse (8140261), we get a palindrome (9760679).

The spelling of 1620418 in words is "one million, six hundred twenty thousand, four hundred eighteen".