123420591 has 40 divisors (see below), whose sum is σ = 212747040. Its totient is φ = 69844032.

The previous prime is 123420559. The next prime is 123420611. The reversal of 123420591 is 195024321.

It is not a de Polignac number, because 123420591 - 2⁵ = 123420559 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 (123400591) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 60805 + ... + 62801.

It is an arithmetic number, because the mean of its divisors is an integer number (5318676).

Almost surely, 2^123420591 is an apocalyptic number.

123420591 is a deficient number, since it is larger than the sum of its proper divisors (89326449).

123420591 is a wasteful number, since it uses less digits than its factorization.

123420591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125 (or 2116 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 123420591 is about 11109.4820311300. The cubic root of 123420591 is about 497.8851890941.

The spelling of 123420591 in words is "one hundred twenty-three million, four hundred twenty thousand, five hundred ninety-one".