3870399 has 8 divisors (see below), whose sum is σ = 5557552. Its totient is φ = 2381760.

The previous prime is 3870337. The next prime is 3870401. The reversal of 3870399 is 9930783.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3870399 - 2¹⁹ = 3346111 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 99241 = 3870399 / (3 + 8 + 7 + 0 + 3 + 9 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3870199) 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, 49582 + ... + 49659.

It is an arithmetic number, because the mean of its divisors is an integer number (694694).

Almost surely, 2^3870399 is an apocalyptic number.

3870399 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

3870399 is a deficient number, since it is larger than the sum of its proper divisors (1687153).

3870399 is a wasteful number, since it uses less digits than its factorization.

3870399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99257.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 3870399 is about 1967.3329662261. The cubic root of 3870399 is about 157.0068424405.

The spelling of 3870399 in words is "three million, eight hundred seventy thousand, three hundred ninety-nine".