1623506 has 4 divisors (see below), whose sum is σ = 2435262. Its totient is φ = 811752.

The previous prime is 1623487. The next prime is 1623533. The reversal of 1623506 is 6053261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6053261 = 719 ⋅8419.

It can be written as a sum of positive squares in only one way, i.e., 1311025 + 312481 = 1145^2 + 559^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405875 + ... + 405878.

2^1623506 is an apocalyptic number.

1623506 is a deficient number, since it is larger than the sum of its proper divisors (811756).

1623506 is an equidigital number, since it uses as much as digits as its factorization.

1623506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811755.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1623506 is about 1274.1687486358. The cubic root of 1623506 is about 117.5306936564.

Adding to 1623506 its reverse (6053261), we get a palindrome (7676767).

The spelling of 1623506 in words is "one million, six hundred twenty-three thousand, five hundred six".