3990061 has 2 divisors, whose sum is σ = 3990062. Its totient is φ = 3990060.

The previous prime is 3990047. The next prime is 3990073. The reversal of 3990061 is 1600993.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2621161 + 1368900 = 1619^2 + 1170^2 .

It is an emirp because it is prime and its reverse (1600993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3990061 - 2⁵ = 3990029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3990001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1995030 + 1995031.

It is an arithmetic number, because the mean of its divisors is an integer number (1995031).

Almost surely, 2^3990061 is an apocalyptic number.

It is an amenable number.

3990061 is a deficient number, since it is larger than the sum of its proper divisors (1).

3990061 is an equidigital number, since it uses as much as digits as its factorization.

3990061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 3990061 is about 1997.5137045838. The cubic root of 3990061 is about 158.6085196587.

It can be divided in two parts, 39 and 90061, that added together give a triangular number (90100 = T₄₂₄).

The spelling of 3990061 in words is "three million, nine hundred ninety thousand, sixty-one".