1225429980 has 24 divisors (see below), whose sum is σ = 3431204112. Its totient is φ = 326781312.

The previous prime is 1225429951. The next prime is 1225429987. The reversal of 1225429980 is 899245221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225429987) 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, 10211857 + ... + 10211976.

It is an arithmetic number, because the mean of its divisors is an integer number (142966838).

Almost surely, 2^1225429980 is an apocalyptic number.

1225429980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225429980 is an abundant number, since it is smaller than the sum of its proper divisors (2205774132).

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

1225429980 is a wasteful number, since it uses less digits than its factorization.

1225429980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20423845 (or 20423843 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 1225429980 is about 35006.1420325062. The cubic root of 1225429980 is about 1070.1126559115.

The spelling of 1225429980 in words is "one billion, two hundred twenty-five million, four hundred twenty-nine thousand, nine hundred eighty".