1621057 has 4 divisors (see below), whose sum is σ = 1658800. Its totient is φ = 1583316.

The previous prime is 1621049. The next prime is 1621079. The reversal of 1621057 is 7501261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1621057 - 2³ = 1621049 is a prime.

It is a Duffinian number.

1621057 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1621097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18807 + ... + 18892.

It is an arithmetic number, because the mean of its divisors is an integer number (414700).

2^1621057 is an apocalyptic number.

It is an amenable number.

1621057 is a deficient number, since it is larger than the sum of its proper divisors (37743).

1621057 is an equidigital number, since it uses as much as digits as its factorization.

1621057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37742.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 1621057 is about 1273.2073672423. The cubic root of 1621057 is about 117.4715669847.

The spelling of 1621057 in words is "one million, six hundred twenty-one thousand, fifty-seven".