1387220 has 24 divisors (see below), whose sum is σ = 2940000. Its totient is φ = 549792.

The previous prime is 1387213. The next prime is 1387231. The reversal of 1387220 is 227831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2531 + ... + 3029.

It is an arithmetic number, because the mean of its divisors is an integer number (122500).

2^1387220 is an apocalyptic number.

1387220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1387220 is an abundant number, since it is smaller than the sum of its proper divisors (1552780).

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

1387220 is a wasteful number, since it uses less digits than its factorization.

1387220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647 (or 645 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1387220 is about 1177.8030395614. The cubic root of 1387220 is about 111.5274520674.

The spelling of 1387220 in words is "one million, three hundred eighty-seven thousand, two hundred twenty".