2920021439 has 4 divisors (see below), whose sum is σ = 3091787424. Its totient is φ = 2748255456.

The previous prime is 2920021411. The next prime is 2920021459. The reversal of 2920021439 is 9341200292.

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

It is a cyclic number.

It is not a de Polignac number, because 2920021439 - 2⁸ = 2920021183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2920021459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85882967 + ... + 85883000.

It is an arithmetic number, because the mean of its divisors is an integer number (772946856).

Almost surely, 2^2920021439 is an apocalyptic number.

2920021439 is a deficient number, since it is larger than the sum of its proper divisors (171765985).

2920021439 is a wasteful number, since it uses less digits than its factorization.

2920021439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171765984.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 2920021439 is about 54037.2227173085. Note that the first 3 decimals coincide. The cubic root of 2920021439 is about 1429.3173978207.

The spelling of 2920021439 in words is "two billion, nine hundred twenty million, twenty-one thousand, four hundred thirty-nine".