3491784921 has 16 divisors (see below), whose sum is σ = 4934952000. Its totient is φ = 2188535808.

The previous prime is 3491784917. The next prime is 3491784929. The reversal of 3491784921 is 1294871943.

It is not a de Polignac number, because 3491784921 - 2² = 3491784917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3491784929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10530 + ... + 84228.

It is an arithmetic number, because the mean of its divisors is an integer number (308434500).

Almost surely, 2^3491784921 is an apocalyptic number.

3491784921 is the 31586-th nonagonal number.

It is an amenable number.

3491784921 is a deficient number, since it is larger than the sum of its proper divisors (1443167079).

3491784921 is a wasteful number, since it uses less digits than its factorization.

3491784921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74648.

The product of its digits is 435456, while the sum is 48.

The square root of 3491784921 is about 59091.3269524386. The cubic root of 3491784921 is about 1517.1056592185.

The spelling of 3491784921 in words is "three billion, four hundred ninety-one million, seven hundred eighty-four thousand, nine hundred twenty-one".