1261623 has 8 divisors (see below), whose sum is σ = 1835136. Its totient is φ = 764600.

The previous prime is 1261571. The next prime is 1261627. The reversal of 1261623 is 3261621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1261623 - 2¹⁰ = 1260599 is a prime.

1261623 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1261623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19083 + ... + 19148.

It is an arithmetic number, because the mean of its divisors is an integer number (229392).

2^1261623 is an apocalyptic number.

1261623 is a deficient number, since it is larger than the sum of its proper divisors (573513).

1261623 is a wasteful number, since it uses less digits than its factorization.

1261623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38245.

The product of its digits is 432, while the sum is 21.

The square root of 1261623 is about 1123.2199250369. The cubic root of 1261623 is about 108.0545848901.

The spelling of 1261623 in words is "one million, two hundred sixty-one thousand, six hundred twenty-three".