2091715438 has 4 divisors (see below), whose sum is σ = 3137573160. Its totient is φ = 1045857718.

The previous prime is 2091715429. The next prime is 2091715471. The reversal of 2091715438 is 8345171902.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2091715438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 522928858 + ... + 522928861.

It is an arithmetic number, because the mean of its divisors is an integer number (784393290).

Almost surely, 2^2091715438 is an apocalyptic number.

2091715438 is a deficient number, since it is larger than the sum of its proper divisors (1045857722).

2091715438 is a wasteful number, since it uses less digits than its factorization.

2091715438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045857721.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 2091715438 is about 45735.2756414565. The cubic root of 2091715438 is about 1278.8929714742.

The spelling of 2091715438 in words is "two billion, ninety-one million, seven hundred fifteen thousand, four hundred thirty-eight".