122729840 has 40 divisors (see below), whose sum is σ = 297757728. Its totient is φ = 46956800.

The previous prime is 122729813. The next prime is 122729861. The reversal of 122729840 is 48927221.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×122729840² = 30125227252851200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 122729840.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31511 + ... + 35190.

Almost surely, 2^122729840 is an apocalyptic number.

122729840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122729840 is an abundant number, since it is smaller than the sum of its proper divisors (175027888).

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

122729840 is a wasteful number, since it uses less digits than its factorization.

122729840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66737 (or 66731 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 122729840 is about 11078.3500576575. The cubic root of 122729840 is about 496.9546088443.

The spelling of 122729840 in words is "one hundred twenty-two million, seven hundred twenty-nine thousand, eight hundred forty".