1227215990 has 64 divisors (see below), whose sum is σ = 2965939200. Its totient is φ = 353082240.

The previous prime is 1227215987. The next prime is 1227215993. The reversal of 1227215990 is 995127221.

It is an interprime number because it is at equal distance from previous prime (1227215987) and next prime (1227215993).

It is a super-2 number, since 2×1227215990² = 3012118172223360200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1227215993) 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, 51290 + ... + 71309.

It is an arithmetic number, because the mean of its divisors is an integer number (46342800).

Almost surely, 2^1227215990 is an apocalyptic number.

1227215990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1227215990 is an abundant number, since it is smaller than the sum of its proper divisors (1738723210).

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

1227215990 is a wasteful number, since it uses less digits than its factorization.

1227215990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122637.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 1227215990 is about 35031.6426962825. The cubic root of 1227215990 is about 1070.6322841712.

The spelling of 1227215990 in words is "one billion, two hundred twenty-seven million, two hundred fifteen thousand, nine hundred ninety".