123640425 has 30 divisors (see below), whose sum is σ = 229028558. Its totient is φ = 65940480.

The previous prime is 123640423. The next prime is 123640441. The reversal of 123640425 is 524046321.

123640425 is a `hidden beast` number, since 1 + 236 + 4 + 0 + 425 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 26873856 + 96766569 = 5184^2 + 9837^2 .

It is not a de Polignac number, because 123640425 - 2¹ = 123640423 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123640423) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 28504 + ... + 32553.

Almost surely, 2^123640425 is an apocalyptic number.

123640425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123640425 is a deficient number, since it is larger than the sum of its proper divisors (105388133).

123640425 is an equidigital number, since it uses as much as digits as its factorization.

123640425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61079 (or 61065 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 123640425 is about 11119.3716099427. The cubic root of 123640425 is about 498.1806210839.

Adding to 123640425 its reverse (524046321), we get a palindrome (647686746).

The spelling of 123640425 in words is "one hundred twenty-three million, six hundred forty thousand, four hundred twenty-five".