1220120428 has 6 divisors (see below), whose sum is σ = 2135210756. Its totient is φ = 610060212.

The previous prime is 1220120401. The next prime is 1220120437. The reversal of 1220120428 is 8240210221.

It is a junction number, because it is equal to n+sod(n) for n = 1220120399 and 1220120408.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152515050 + ... + 152515057.

Almost surely, 2^1220120428 is an apocalyptic number.

It is an amenable number.

1220120428 is a deficient number, since it is larger than the sum of its proper divisors (915090328).

1220120428 is a wasteful number, since it uses less digits than its factorization.

1220120428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305030111 (or 305030109 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 1220120428 is about 34930.2222724105. Note that the first 4 decimals coincide. The cubic root of 1220120428 is about 1068.5648877075.

Adding to 1220120428 its reverse (8240210221), we get a palindrome (9460330649).

The spelling of 1220120428 in words is "one billion, two hundred twenty million, one hundred twenty thousand, four hundred twenty-eight".