1621572 has 12 divisors (see below), whose sum is σ = 3783696. Its totient is φ = 540520.

The previous prime is 1621559. The next prime is 1621583. The reversal of 1621572 is 2751261.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67554 + ... + 67577.

It is an arithmetic number, because the mean of its divisors is an integer number (315308).

2^1621572 is an apocalyptic number.

1621572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1621572 is an abundant number, since it is smaller than the sum of its proper divisors (2162124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1621572 is a wasteful number, since it uses less digits than its factorization.

1621572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135138 (or 135136 counting only the distinct ones).

The product of its digits is 840, while the sum is 24.

The square root of 1621572 is about 1273.4095963201. The cubic root of 1621572 is about 117.4840056696.

The spelling of 1621572 in words is "one million, six hundred twenty-one thousand, five hundred seventy-two".