1379815 has 4 divisors (see below), whose sum is σ = 1655784. Its totient is φ = 1103848.

The previous prime is 1379813. The next prime is 1379821. The reversal of 1379815 is 5189731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5189731 = 37 ⋅140263.

It is a cyclic number.

It is not a de Polignac number, because 1379815 - 2¹ = 1379813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1379813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137977 + ... + 137986.

It is an arithmetic number, because the mean of its divisors is an integer number (413946).

2^1379815 is an apocalyptic number.

1379815 is a deficient number, since it is larger than the sum of its proper divisors (275969).

1379815 is an equidigital number, since it uses as much as digits as its factorization.

1379815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275968.

The product of its digits is 7560, while the sum is 34.

The square root of 1379815 is about 1174.6552685788. The cubic root of 1379815 is about 111.3286528763.

The spelling of 1379815 in words is "one million, three hundred seventy-nine thousand, eight hundred fifteen".