1621485 has 16 divisors (see below), whose sum is σ = 2882880. Its totient is φ = 864720.

The previous prime is 1621481. The next prime is 1621489. The reversal of 1621485 is 5841261.

It is an interprime number because it is at equal distance from previous prime (1621481) and next prime (1621489).

It is not a de Polignac number, because 1621485 - 2² = 1621481 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5871 + ... + 6140.

It is an arithmetic number, because the mean of its divisors is an integer number (180180).

2^1621485 is an apocalyptic number.

1621485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1621485 is a deficient number, since it is larger than the sum of its proper divisors (1261395).

1621485 is a wasteful number, since it uses less digits than its factorization.

1621485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12025 (or 12019 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 1621485 is about 1273.3754356041. The cubic root of 1621485 is about 117.4819045621.

The spelling of 1621485 in words is "one million, six hundred twenty-one thousand, four hundred eighty-five".