123401240 has 32 divisors (see below), whose sum is σ = 278987760. Its totient is φ = 49123200.

The previous prime is 123401221. The next prime is 123401261. The reversal of 123401240 is 42104321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1130 + ... + 15750.

Almost surely, 2^123401240 is an apocalyptic number.

123401240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123401240 is an abundant number, since it is smaller than the sum of its proper divisors (155586520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123401240 is a wasteful number, since it uses less digits than its factorization.

123401240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14843 (or 14839 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 123401240 is about 11108.6110742973. The cubic root of 123401240 is about 497.8591667484.

Adding to 123401240 its reverse (42104321), we get a palindrome (165505561).

The spelling of 123401240 in words is "one hundred twenty-three million, four hundred one thousand, two hundred forty".