1620473 has 4 divisors (see below), whose sum is σ = 1625088. Its totient is φ = 1615860.

The previous prime is 1620469. The next prime is 1620497. The reversal of 1620473 is 3740261.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3740261 = 7 ⋅534323.

It is a cyclic number.

It is not a de Polignac number, because 1620473 - 2² = 1620469 is a prime.

It is a super-3 number, since 3×1620473³ = 12765759333086291451, which contains 333 as substring.

It is a d-powerful number, because it can be written as 1 + 6⁴ + 2¹¹ + 0 + 4⁹ + 7⁷ + 3¹² .

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1620403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1733 + ... + 2498.

It is an arithmetic number, because the mean of its divisors is an integer number (406272).

2^1620473 is an apocalyptic number.

It is an amenable number.

1620473 is a deficient number, since it is larger than the sum of its proper divisors (4615).

1620473 is an equidigital number, since it uses as much as digits as its factorization.

1620473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4614.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 1620473 is about 1272.9780045233. The cubic root of 1620473 is about 117.4574585697.

The spelling of 1620473 in words is "one million, six hundred twenty thousand, four hundred seventy-three".