3899742 has 64 divisors (see below), whose sum is σ = 10174464. Its totient is φ = 966240.

The previous prime is 3899737. The next prime is 3899747. The reversal of 3899742 is 2479983.

It is an interprime number because it is at equal distance from previous prime (3899737) and next prime (3899747).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 3899694 and 3899703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3899747) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10443 + ... + 10809.

It is an arithmetic number, because the mean of its divisors is an integer number (158976).

Almost surely, 2^3899742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3899742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5087232).

3899742 is an abundant number, since it is smaller than the sum of its proper divisors (6274722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3899742 is a wasteful number, since it uses less digits than its factorization.

3899742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413.

The product of its digits is 108864, while the sum is 42.

The square root of 3899742 is about 1974.7764430436. The cubic root of 3899742 is about 157.4026205805.

The spelling of 3899742 in words is "three million, eight hundred ninety-nine thousand, seven hundred forty-two".