1415991 has 4 divisors (see below), whose sum is σ = 1887992. Its totient is φ = 943992.

The previous prime is 1415989. The next prime is 1416007. The reversal of 1415991 is 1995141.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1995141 = 3 ⋅665047.

It is not a de Polignac number, because 1415991 - 2¹ = 1415989 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1415971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235996 + ... + 236001.

It is an arithmetic number, because the mean of its divisors is an integer number (471998).

2^1415991 is an apocalyptic number.

1415991 is a deficient number, since it is larger than the sum of its proper divisors (472001).

1415991 is an equidigital number, since it uses as much as digits as its factorization.

1415991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472000.

The product of its digits is 1620, while the sum is 30.

The square root of 1415991 is about 1189.9542007993. The cubic root of 1415991 is about 112.2932102497.

The spelling of 1415991 in words is "one million, four hundred fifteen thousand, nine hundred ninety-one".