4781639 has 4 divisors (see below), whose sum is σ = 4883424. Its totient is φ = 4679856.

The previous prime is 4781629. The next prime is 4781653. The reversal of 4781639 is 9361874.

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 4781639 - 2⁸ = 4781383 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 (4781629) 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, 50822 + ... + 50915.

It is an arithmetic number, because the mean of its divisors is an integer number (1220856).

Almost surely, 2^4781639 is an apocalyptic number.

4781639 is a deficient number, since it is larger than the sum of its proper divisors (101785).

4781639 is a wasteful number, since it uses less digits than its factorization.

4781639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101784.

The product of its digits is 36288, while the sum is 38.

The square root of 4781639 is about 2186.6959093573. The cubic root of 4781639 is about 168.4711711811.

The spelling of 4781639 in words is "four million, seven hundred eighty-one thousand, six hundred thirty-nine".