1220387279 has 8 divisors (see below), whose sum is σ = 1292727600. Its totient is φ = 1148108416.

The previous prime is 1220387249. The next prime is 1220387303. The reversal of 1220387279 is 9727830221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220387279 - 2¹² = 1220383183 is a prime.

It is a super-2 number, since 2×1220387279² = 2978690221490047682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220387249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29252 + ... + 57414.

It is an arithmetic number, because the mean of its divisors is an integer number (161590950).

Almost surely, 2^1220387279 is an apocalyptic number.

1220387279 is a deficient number, since it is larger than the sum of its proper divisors (72340321).

1220387279 is a wasteful number, since it uses less digits than its factorization.

1220387279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30729.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 1220387279 is about 34934.0418360086. The cubic root of 1220387279 is about 1068.6427835219.

The spelling of 1220387279 in words is "one billion, two hundred twenty million, three hundred eighty-seven thousand, two hundred seventy-nine".