1227215400 has 48 divisors (see below), whose sum is σ = 3804369600. Its totient is φ = 327257280.

The previous prime is 1227215389. The next prime is 1227215411. The reversal of 1227215400 is 45127221.

It is an interprime number because it is at equal distance from previous prime (1227215389) and next prime (1227215411).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1022080 + ... + 1023279.

It is an arithmetic number, because the mean of its divisors is an integer number (79257700).

Almost surely, 2^1227215400 is an apocalyptic number.

1227215400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1227215400 is an abundant number, since it is smaller than the sum of its proper divisors (2577154200).

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

1227215400 is a wasteful number, since it uses less digits than its factorization.

1227215400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045378 (or 2045369 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 1227215400 is about 35031.6342753232. The cubic root of 1227215400 is about 1070.6321125977.

It can be divided in two parts, 12272 and 15400, that added together give a palindrome (27672).

The spelling of 1227215400 in words is "one billion, two hundred twenty-seven million, two hundred fifteen thousand, four hundred".