122749420 has 24 divisors (see below), whose sum is σ = 258665904. Its totient is φ = 48929856.

The previous prime is 122749409. The next prime is 122749421. The reversal of 122749420 is 24947221.

It is a super-2 number, since 2×122749420² = 30134840220672800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (122749421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4614 + ... + 16333.

It is an arithmetic number, because the mean of its divisors is an integer number (10777746).

Almost surely, 2^122749420 is an apocalyptic number.

122749420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122749420 is an abundant number, since it is smaller than the sum of its proper divisors (135916484).

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

122749420 is a wasteful number, since it uses less digits than its factorization.

122749420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21249 (or 21247 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 122749420 is about 11079.2337280157. The cubic root of 122749420 is about 496.9810350551.

The spelling of 122749420 in words is "one hundred twenty-two million, seven hundred forty-nine thousand, four hundred twenty".