1621047 has 4 divisors (see below), whose sum is σ = 2161400. Its totient is φ = 1080696.

The previous prime is 1621043. The next prime is 1621049. The reversal of 1621047 is 7401261.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1621047 - 2² = 1621043 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621043) 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, 270172 + ... + 270177.

It is an arithmetic number, because the mean of its divisors is an integer number (540350).

2^1621047 is an apocalyptic number.

1621047 is a deficient number, since it is larger than the sum of its proper divisors (540353).

1621047 is an equidigital number, since it uses as much as digits as its factorization.

1621047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540352.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 1621047 is about 1273.2034401462. The cubic root of 1621047 is about 117.4713254308.

The spelling of 1621047 in words is "one million, six hundred twenty-one thousand, forty-seven".