1387390 has 8 divisors (see below), whose sum is σ = 2497320. Its totient is φ = 554952.

The previous prime is 1387367. The next prime is 1387403. The reversal of 1387390 is 937831.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69360 + ... + 69379.

It is an arithmetic number, because the mean of its divisors is an integer number (312165).

2^1387390 is an apocalyptic number.

1387390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1387390 is a deficient number, since it is larger than the sum of its proper divisors (1109930).

1387390 is a wasteful number, since it uses less digits than its factorization.

1387390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138746.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 1387390 is about 1177.8752056139. The cubic root of 1387390 is about 111.5320076756.

The spelling of 1387390 in words is "one million, three hundred eighty-seven thousand, three hundred ninety".