1881415 has 4 divisors (see below), whose sum is σ = 2257704. Its totient is φ = 1505128.

The previous prime is 1881403. The next prime is 1881419. The reversal of 1881415 is 5141881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5141881 = 131 ⋅39251.

It is a cyclic number.

It is not a de Polignac number, because 1881415 - 2⁹ = 1880903 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 (1881419) 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, 188137 + ... + 188146.

It is an arithmetic number, because the mean of its divisors is an integer number (564426).

2^1881415 is an apocalyptic number.

1881415 is a deficient number, since it is larger than the sum of its proper divisors (376289).

1881415 is an equidigital number, since it uses as much as digits as its factorization.

1881415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376288.

The product of its digits is 1280, while the sum is 28.

The square root of 1881415 is about 1371.6468204316. The cubic root of 1881415 is about 123.4510725342.

The spelling of 1881415 in words is "one million, eight hundred eighty-one thousand, four hundred fifteen".