3921720542 has 8 divisors (see below), whose sum is σ = 5883442536. Its totient is φ = 1960573032.

The previous prime is 3921720533. The next prime is 3921720553. The reversal of 3921720542 is 2450271293.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126128 + ... + 154115.

It is an arithmetic number, because the mean of its divisors is an integer number (735430317).

Almost surely, 2^3921720542 is an apocalyptic number.

3921720542 is a deficient number, since it is larger than the sum of its proper divisors (1961721994).

3921720542 is a wasteful number, since it uses less digits than its factorization.

3921720542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287242.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 3921720542 is about 62623.6420371731. The cubic root of 3921720542 is about 1576.9776842100.

The spelling of 3921720542 in words is "three billion, nine hundred twenty-one million, seven hundred twenty thousand, five hundred forty-two".