3999720 has 32 divisors (see below), whose sum is σ = 11999520. Its totient is φ = 1066560.

The previous prime is 3999719. The next prime is 3999727. The reversal of 3999720 is 279993.

3999720 = T₁₆₀ + T₁₆₁ + ... + T₃₀₃.

It is not an unprimeable number, because it can be changed into a prime (3999727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16546 + ... + 16785.

It is an arithmetic number, because the mean of its divisors is an integer number (374985).

Almost surely, 2^3999720 is an apocalyptic number.

3999720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3999720 is an abundant number, since it is smaller than the sum of its proper divisors (7999800).

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

3999720 is a wasteful number, since it uses less digits than its factorization.

3999720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33345 (or 33341 counting only the distinct ones).

The product of its (nonzero) digits is 30618, while the sum is 39.

The square root of 3999720 is about 1999.9299987750. The cubic root of 3999720 is about 158.7364011746.

The spelling of 3999720 in words is "three million, nine hundred ninety-nine thousand, seven hundred twenty".