3900439749 has 4 divisors (see below), whose sum is σ = 5200586336. Its totient is φ = 2600293164.

The previous prime is 3900439691. The next prime is 3900439769. The reversal of 3900439749 is 9479340093.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3900439749 - 2²⁴ = 3883662533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3900439698 and 3900439707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3900439769) 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, 650073289 + ... + 650073294.

It is an arithmetic number, because the mean of its divisors is an integer number (1300146584).

Almost surely, 2^3900439749 is an apocalyptic number.

It is an amenable number.

3900439749 is a deficient number, since it is larger than the sum of its proper divisors (1300146587).

3900439749 is a wasteful number, since it uses less digits than its factorization.

3900439749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300146586.

The product of its (nonzero) digits is 734832, while the sum is 48.

The square root of 3900439749 is about 62453.5006945167. The cubic root of 3900439749 is about 1574.1200760929.

The spelling of 3900439749 in words is "three billion, nine hundred million, four hundred thirty-nine thousand, seven hundred forty-nine".