1387228220 has 72 divisors (see below), whose sum is σ = 3588184656. Its totient is φ = 447638016.

The previous prime is 1387228217. The next prime is 1387228231. The reversal of 1387228220 is 228227831.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 24974 + ... + 58293.

It is an arithmetic number, because the mean of its divisors is an integer number (49835898).

Almost surely, 2^1387228220 is an apocalyptic number.

1387228220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1387228220 is an abundant number, since it is smaller than the sum of its proper divisors (2200956436).

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

1387228220 is a wasteful number, since it uses less digits than its factorization.

1387228220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83307 (or 83298 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 1387228220 is about 37245.5127498602. The cubic root of 1387228220 is about 1115.2767235302.

The spelling of 1387228220 in words is "one billion, three hundred eighty-seven million, two hundred twenty-eight thousand, two hundred twenty".