1623906 has 12 divisors (see below), whose sum is σ = 3518502. Its totient is φ = 541296.

The previous prime is 1623901. The next prime is 1623907. The reversal of 1623906 is 6093261.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1083681 + 540225 = 1041^2 + 735^2 .

It is a super-4 number, since 4×1623906⁴ (a number of 26 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1623906.

It is not an unprimeable number, because it can be changed into a prime (1623901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45091 + ... + 45126.

2^1623906 is an apocalyptic number.

1623906 is an abundant number, since it is smaller than the sum of its proper divisors (1894596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1623906 is a wasteful number, since it uses less digits than its factorization.

1623906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90225 (or 90222 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 1623906 is about 1274.3257040490. The cubic root of 1623906 is about 117.5403452822.

The spelling of 1623906 in words is "one million, six hundred twenty-three thousand, nine hundred six".