3990429 has 12 divisors (see below), whose sum is σ = 5963100. Its totient is φ = 2568384.

The previous prime is 3990419. The next prime is 3990449. The reversal of 3990429 is 9240993.

It can be written as a sum of positive squares in 2 ways, for example, as 2295225 + 1695204 = 1515^2 + 1302^2 .

It is not a de Polignac number, because 3990429 - 2¹¹ = 3988381 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3990393 and 3990402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3990419) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7384 + ... + 7905.

It is an arithmetic number, because the mean of its divisors is an integer number (496925).

Almost surely, 2^3990429 is an apocalyptic number.

It is an amenable number.

3990429 is a deficient number, since it is larger than the sum of its proper divisors (1972671).

3990429 is a wasteful number, since it uses less digits than its factorization.

3990429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15324 (or 15321 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 3990429 is about 1997.6058169719. The cubic root of 3990429 is about 158.6133956193.

The spelling of 3990429 in words is "three million, nine hundred ninety thousand, four hundred twenty-nine".