2139784654 has 32 divisors (see below), whose sum is σ = 3741002496. Its totient is φ = 899021760.

The previous prime is 2139784627. The next prime is 2139784667. The reversal of 2139784654 is 4564879312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2139784598 and 2139784607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145194 + ... + 159250.

It is an arithmetic number, because the mean of its divisors is an integer number (116906328).

Almost surely, 2^2139784654 is an apocalyptic number.

2139784654 is a deficient number, since it is larger than the sum of its proper divisors (1601217842).

2139784654 is a wasteful number, since it uses less digits than its factorization.

2139784654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14280.

The product of its digits is 1451520, while the sum is 49.

The square root of 2139784654 is about 46257.8064114588. The cubic root of 2139784654 is about 1288.6155156239.

The spelling of 2139784654 in words is "two billion, one hundred thirty-nine million, seven hundred eighty-four thousand, six hundred fifty-four".