1387040 has 24 divisors (see below), whose sum is σ = 3277260. Its totient is φ = 554752.

The previous prime is 1387039. The next prime is 1387069. The reversal of 1387040 is 407831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1373584 + 13456 = 1172^2 + 116^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1386997 and 1387015.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4175 + ... + 4494.

2^1387040 is an apocalyptic number.

1387040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1387040 is an abundant number, since it is smaller than the sum of its proper divisors (1890220).

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

1387040 is an equidigital number, since it uses as much as digits as its factorization.

1387040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8684 (or 8676 counting only the distinct ones).

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

The square root of 1387040 is about 1177.7266236271. The cubic root of 1387040 is about 111.5226280766.

The spelling of 1387040 in words is "one million, three hundred eighty-seven thousand, forty".