3991420 has 24 divisors (see below), whose sum is σ = 8747424. Its totient is φ = 1526976.

The previous prime is 3991399. The next prime is 3991441. The reversal of 3991420 is 241993.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3991399) and next prime (3991441).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3879 + ... + 4798.

It is an arithmetic number, because the mean of its divisors is an integer number (364476).

Almost surely, 2^3991420 is an apocalyptic number.

It is an amenable number.

3991420 is an abundant number, since it is smaller than the sum of its proper divisors (4756004).

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

3991420 is a wasteful number, since it uses less digits than its factorization.

3991420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8709 (or 8707 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 3991420 is about 1997.8538485084. The cubic root of 3991420 is about 158.6265247728.

It can be divided in two parts, 399 and 1420, that multiplied together give a triangular number (566580 = T₁₀₆₄).

The spelling of 3991420 in words is "three million, nine hundred ninety-one thousand, four hundred twenty".