123721007 has 8 divisors (see below), whose sum is σ = 127317936. Its totient is φ = 120137472.

The previous prime is 123720991. The next prime is 123721033. The reversal of 123721007 is 700127321.

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 123721007 - 2⁴ = 123720991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123721207) 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 7 ways as a sum of consecutive naturals, for example, 17183 + ... + 23295.

It is an arithmetic number, because the mean of its divisors is an integer number (15914742).

Almost surely, 2^123721007 is an apocalyptic number.

123721007 is a deficient number, since it is larger than the sum of its proper divisors (3596929).

123721007 is an equidigital number, since it uses as much as digits as its factorization.

123721007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6697.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 123721007 is about 11122.9945158667. The cubic root of 123721007 is about 498.2888264509.

Adding to 123721007 its reverse (700127321), we get a palindrome (823848328).

The spelling of 123721007 in words is "one hundred twenty-three million, seven hundred twenty-one thousand, seven".