1621265 has 8 divisors (see below), whose sum is σ = 1987200. Its totient is φ = 1269232.

The previous prime is 1621259. The next prime is 1621283. The reversal of 1621265 is 5621261.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1621265 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1621265.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3215 + ... + 3684.

It is an arithmetic number, because the mean of its divisors is an integer number (248400).

2^1621265 is an apocalyptic number.

It is an amenable number.

1621265 is a deficient number, since it is larger than the sum of its proper divisors (365935).

1621265 is an equidigital number, since it uses as much as digits as its factorization.

1621265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6951.

The product of its digits is 720, while the sum is 23.

The square root of 1621265 is about 1273.2890480955. The cubic root of 1621265 is about 117.4765910814.

The spelling of 1621265 in words is "one million, six hundred twenty-one thousand, two hundred sixty-five".