1381515 has 16 divisors (see below), whose sum is σ = 2282496. Its totient is φ = 712800.

The previous prime is 1381507. The next prime is 1381517. The reversal of 1381515 is 5151831.

It is not a de Polignac number, because 1381515 - 2³ = 1381507 is a prime.

1381515 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1381517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1021 + ... + 1950.

It is an arithmetic number, because the mean of its divisors is an integer number (142656).

2^1381515 is an apocalyptic number.

1381515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1381515 is a deficient number, since it is larger than the sum of its proper divisors (900981).

1381515 is a wasteful number, since it uses less digits than its factorization.

1381515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3010.

The product of its digits is 600, while the sum is 24.

The square root of 1381515 is about 1175.3786623893. The cubic root of 1381515 is about 111.3743549059.

It can be divided in two parts, 138 and 1515, that added together give a triangular number (1653 = T₅₇).

The spelling of 1381515 in words is "one million, three hundred eighty-one thousand, five hundred fifteen".