1620423 has 36 divisors (see below), whose sum is σ = 2873520. Its totient is φ = 861696.

The previous prime is 1620413. The next prime is 1620431. The reversal of 1620423 is 3240261.

It is a happy number.

1620423 is a `hidden beast` number, since 1 + 620 + 42 + 3 = 666.

It is not a de Polignac number, because 1620423 - 2⁵ = 1620391 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1620396 and 1620405.

It is a congruent number.

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

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 18163 + ... + 18251.

It is an arithmetic number, because the mean of its divisors is an integer number (79820).

2^1620423 is an apocalyptic number.

1620423 is a deficient number, since it is larger than the sum of its proper divisors (1253097).

1620423 is a wasteful number, since it uses less digits than its factorization.

1620423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1620423 is about 1272.9583653836. The cubic root of 1620423 is about 117.4562504999.

Adding to 1620423 its reverse (3240261), we get a palindrome (4860684).

The spelling of 1620423 in words is "one million, six hundred twenty thousand, four hundred twenty-three".