1620261 has 12 divisors (see below), whose sum is σ = 2376192. Its totient is φ = 1063656.

The previous prime is 1620257. The next prime is 1620271.

It is a happy number.

1620261 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1620261 - 2² = 1620257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620251) 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, 741 + ... + 1946.

It is an arithmetic number, because the mean of its divisors is an integer number (198016).

2^1620261 is an apocalyptic number.

It is an amenable number.

1620261 is a deficient number, since it is larger than the sum of its proper divisors (755931).

1620261 is a wasteful number, since it uses less digits than its factorization.

1620261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2760 (or 2757 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1620261 is about 1272.8947324897. The cubic root of 1620261 is about 117.4523361831.

It can be divided in two parts, 1620 and 261, that added together give a palindrome (1881).

The spelling of 1620261 in words is "one million, six hundred twenty thousand, two hundred sixty-one".