1220727400 has 24 divisors (see below), whose sum is σ = 2838191670. Its totient is φ = 488290880.

The previous prime is 1220727377. The next prime is 1220727401. The reversal of 1220727400 is 47270221.

It can be written as a sum of positive squares in 3 ways, for example, as 995907364 + 224820036 = 31558^2 + 14994^2 .

It is a super-2 number, since 2×1220727400² = 2980350770221520000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (1220727401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3051619 + ... + 3052018.

Almost surely, 2^1220727400 is an apocalyptic number.

1220727400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220727400 is an abundant number, since it is smaller than the sum of its proper divisors (1617464270).

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

1220727400 is a wasteful number, since it uses less digits than its factorization.

1220727400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6103653 (or 6103644 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 1220727400 is about 34938.9095422281. The cubic root of 1220727400 is about 1068.7420509423.

Adding to 1220727400 its reverse (47270221), we get a palindrome (1267997621).

The spelling of 1220727400 in words is "one billion, two hundred twenty million, seven hundred twenty-seven thousand, four hundred".