122420640 has 48 divisors (see below), whose sum is σ = 385626528. Its totient is φ = 32645376.

The previous prime is 122420609. The next prime is 122420659. The reversal of 122420640 is 46024221.

It is a tau number, because it is divible by the number of its divisors (48).

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, 127042 + ... + 128001.

It is an arithmetic number, because the mean of its divisors is an integer number (8033886).

Almost surely, 2^122420640 is an apocalyptic number.

122420640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122420640 is an abundant number, since it is smaller than the sum of its proper divisors (263205888).

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

122420640 is a wasteful number, since it uses less digits than its factorization.

122420640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255061 (or 255053 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 122420640 is about 11064.3861103994. The cubic root of 122420640 is about 496.5369229038.

Adding to 122420640 its reverse (46024221), we get a palindrome (168444861).

The spelling of 122420640 in words is "one hundred twenty-two million, four hundred twenty thousand, six hundred forty".