3990026 has 4 divisors (see below), whose sum is σ = 5985042. Its totient is φ = 1995012.

The previous prime is 3990011. The next prime is 3990029. The reversal of 3990026 is 6200993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6200993 = 433 ⋅14321.

It can be written as a sum of positive squares in only one way, i.e., 3900625 + 89401 = 1975^2 + 299^2 .

It is not an unprimeable number, because it can be changed into a prime (3990029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997505 + ... + 997508.

Almost surely, 2^3990026 is an apocalyptic number.

3990026 is a deficient number, since it is larger than the sum of its proper divisors (1995016).

3990026 is a wasteful number, since it uses less digits than its factorization.

3990026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995015.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 3990026 is about 1997.5049436735. The cubic root of 3990026 is about 158.6080558968.

The spelling of 3990026 in words is "three million, nine hundred ninety thousand, twenty-six".