1387406 has 8 divisors (see below), whose sum is σ = 2171664. Its totient is φ = 663520.

The previous prime is 1387403. The next prime is 1387417. The reversal of 1387406 is 6047831.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15035 + ... + 15126.

It is an arithmetic number, because the mean of its divisors is an integer number (271458).

2^1387406 is an apocalyptic number.

1387406 is a deficient number, since it is larger than the sum of its proper divisors (784258).

1387406 is a wasteful number, since it uses less digits than its factorization.

1387406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30186.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 1387406 is about 1177.8819974853. The cubic root of 1387406 is about 111.5324364196.

It can be divided in two parts, 13 and 87406, that multiplied together give a triangular number (1136278 = T₁₅₀₇).

The spelling of 1387406 in words is "one million, three hundred eighty-seven thousand, four hundred six".