123721263 has 36 divisors (see below), whose sum is σ = 189835464. Its totient is φ = 80514000.

The previous prime is 123721261. The next prime is 123721267. The reversal of 123721263 is 362127321.

It is not a de Polignac number, because 123721263 - 2¹ = 123721261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123721261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1224913 + ... + 1225013.

Almost surely, 2^123721263 is an apocalyptic number.

123721263 is a deficient number, since it is larger than the sum of its proper divisors (66114201).

123721263 is an frugal number, since it uses more digits than its factorization.

123721263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258 (or 175 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 123721263 is about 11123.0060235532. The cubic root of 123721263 is about 498.2891701323.

Adding to 123721263 its reverse (362127321), we get a palindrome (485848584).

It can be divided in two parts, 1237 and 21263, that added together give a square (22500 = 150²).

The spelling of 123721263 in words is "one hundred twenty-three million, seven hundred twenty-one thousand, two hundred sixty-three".