3999970 has 32 divisors (see below), whose sum is σ = 8028720. Its totient is φ = 1424640.

The previous prime is 3999949. The next prime is 3999971. The reversal of 3999970 is 799993.

It can be written as a sum of positive squares in 8 ways, for example, as 1320201 + 2679769 = 1149^2 + 1637^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3999970.

It is not an unprimeable number, because it can be changed into a prime (3999971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3240 + ... + 4300.

Almost surely, 2^3999970 is an apocalyptic number.

3999970 is an abundant number, since it is smaller than the sum of its proper divisors (4028750).

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

3999970 is a wasteful number, since it uses less digits than its factorization.

3999970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110.

The product of its (nonzero) digits is 137781, while the sum is 46.

The square root of 3999970 is about 1999.9924999859. The cubic root of 3999970 is about 158.7397083456.

The spelling of 3999970 in words is "three million, nine hundred ninety-nine thousand, nine hundred seventy".