122447840 has 48 divisors (see below), whose sum is σ = 290530800. Its totient is φ = 48768000.

The previous prime is 122447839. The next prime is 122447869. The reversal of 122447840 is 48744221.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 122447797 and 122447806.

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, 38636 + ... + 41684.

It is an arithmetic number, because the mean of its divisors is an integer number (6052725).

Almost surely, 2^122447840 is an apocalyptic number.

122447840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 122447840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145265400).

122447840 is an abundant number, since it is smaller than the sum of its proper divisors (168082960).

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

122447840 is a wasteful number, since it uses less digits than its factorization.

122447840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3315 (or 3307 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 32.

The square root of 122447840 is about 11065.6152110942. The cubic root of 122447840 is about 496.5736944923.

The spelling of 122447840 in words is "one hundred twenty-two million, four hundred forty-seven thousand, eight hundred forty".