2139393774 has 32 divisors (see below), whose sum is σ = 4918325760. Its totient is φ = 607720032.

The previous prime is 2139393757. The next prime is 2139393779. The reversal of 2139393774 is 4773939312.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139393779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139954 + ... + 154485.

It is an arithmetic number, because the mean of its divisors is an integer number (153697680).

Almost surely, 2^2139393774 is an apocalyptic number.

2139393774 is an abundant number, since it is smaller than the sum of its proper divisors (2778931986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2139393774 is a wasteful number, since it uses less digits than its factorization.

2139393774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294624.

The product of its digits is 857304, while the sum is 48.

The square root of 2139393774 is about 46253.5812018918. The cubic root of 2139393774 is about 1288.5370459354.

The spelling of 2139393774 in words is "two billion, one hundred thirty-nine million, three hundred ninety-three thousand, seven hundred seventy-four".