1906623 has 12 divisors (see below), whose sum is σ = 2821728. Its totient is φ = 1239840.

The previous prime is 1906621. The next prime is 1906627. The reversal of 1906623 is 3266091.

It is a happy number.

It is a Cunningham number, because it is equal to 124³-1.

It is not a de Polignac number, because 1906623 - 2¹ = 1906621 is a prime.

It is a super-2 number, since 2×1906623² = 7270422528258, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1906621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2215 + ... + 2952.

It is an arithmetic number, because the mean of its divisors is an integer number (235144).

2^1906623 is an apocalyptic number.

1906623 is a deficient number, since it is larger than the sum of its proper divisors (915105).

1906623 is a wasteful number, since it uses less digits than its factorization.

1906623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5214 (or 5211 counting only the distinct ones).

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

The square root of 1906623 is about 1380.8051998743. The cubic root of 1906623 is about 123.9999783212. Note that the first 4 decimals are identical.

The spelling of 1906623 in words is "one million, nine hundred six thousand, six hundred twenty-three".