1220888445 has 32 divisors (see below), whose sum is σ = 2292826368. Its totient is φ = 543034368.

The previous prime is 1220888441. The next prime is 1220888477. The reversal of 1220888445 is 5448880221.

It is not a de Polignac number, because 1220888445 - 2² = 1220888441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220888397 and 1220888406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220888441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 153244 + ... + 161013.

It is an arithmetic number, because the mean of its divisors is an integer number (71650824).

Almost surely, 2^1220888445 is an apocalyptic number.

1220888445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220888445 is a deficient number, since it is larger than the sum of its proper divisors (1071937923).

1220888445 is a wasteful number, since it uses less digits than its factorization.

1220888445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314309.

The product of its (nonzero) digits is 163840, while the sum is 42.

The square root of 1220888445 is about 34941.2141317385. The cubic root of 1220888445 is about 1068.7890469644.

The spelling of 1220888445 in words is "one billion, two hundred twenty million, eight hundred eighty-eight thousand, four hundred forty-five".