1220547402 has 24 divisors (see below), whose sum is σ = 2800080036. Its totient is φ = 382916736.

The previous prime is 1220547401. The next prime is 1220547413. The reversal of 1220547402 is 2047450221.

1220547402 is a `hidden beast` number, since 12 + 205 + 47 + 402 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1004192721 + 216354681 = 31689^2 + 14709^2 .

It is not an unprimeable number, because it can be changed into a prime (1220547401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1994053 + ... + 1994664.

Almost surely, 2^1220547402 is an apocalyptic number.

1220547402 is an abundant number, since it is smaller than the sum of its proper divisors (1579532634).

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

1220547402 is a wasteful number, since it uses less digits than its factorization.

1220547402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3988742 (or 3988739 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 1220547402 is about 34936.3335511899. Note that the first 3 decimals coincide. The cubic root of 1220547402 is about 1068.6895191793.

Adding to 1220547402 its reverse (2047450221), we get a palindrome (3267997623).

The spelling of 1220547402 in words is "one billion, two hundred twenty million, five hundred forty-seven thousand, four hundred two".