415991 has 4 divisors (see below), whose sum is σ = 427272. Its totient is φ = 404712.

The previous prime is 415979. The next prime is 415993. The reversal of 415991 is 199514.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-415991 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 (415993) 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, 5585 + ... + 5658.

It is an arithmetic number, because the mean of its divisors is an integer number (106818).

2⁴¹⁵⁹⁹¹ is an apocalyptic number.

415991 is a deficient number, since it is larger than the sum of its proper divisors (11281).

415991 is a wasteful number, since it uses less digits than its factorization.

415991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11280.

The product of its digits is 1620, while the sum is 29.

The square root of 415991 is about 644.9736428723. The cubic root of 415991 is about 74.6496847895.

The spelling of 415991 in words is "four hundred fifteen thousand, nine hundred ninety-one".