1623722 has 4 divisors (see below), whose sum is σ = 2435586. Its totient is φ = 811860.

The previous prime is 1623707. The next prime is 1623733. The reversal of 1623722 is 2273261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2273261 = 31 ⋅73331.

It can be written as a sum of positive squares in only one way, i.e., 1615441 + 8281 = 1271^2 + 91^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405929 + ... + 405932.

2^1623722 is an apocalyptic number.

1623722 is a deficient number, since it is larger than the sum of its proper divisors (811864).

1623722 is an equidigital number, since it uses as much as digits as its factorization.

1623722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811863.

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

The square root of 1623722 is about 1274.2535069601. The cubic root of 1623722 is about 117.5359057312.

Adding to 1623722 its reverse (2273261), we get a palindrome (3896983).

The spelling of 1623722 in words is "one million, six hundred twenty-three thousand, seven hundred twenty-two".