1921749734 has 64 divisors (see below), whose sum is σ = 3236578560. Its totient is φ = 851834880.

The previous prime is 1921749733. The next prime is 1921749743. The reversal of 1921749734 is 4379471291.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921749733) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6062144 + ... + 6062460.

It is an arithmetic number, because the mean of its divisors is an integer number (50571540).

Almost surely, 2^1921749734 is an apocalyptic number.

1921749734 is a deficient number, since it is larger than the sum of its proper divisors (1314828826).

1921749734 is a wasteful number, since it uses less digits than its factorization.

1921749734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513.

The product of its digits is 381024, while the sum is 47.

The square root of 1921749734 is about 43837.7660699083. The cubic root of 1921749734 is about 1243.2704454116.

The spelling of 1921749734 in words is "one billion, nine hundred twenty-one million, seven hundred forty-nine thousand, seven hundred thirty-four".