3994157 has 4 divisors (see below), whose sum is σ = 4167840. Its totient is φ = 3820476.

The previous prime is 3994147. The next prime is 3994171. The reversal of 3994157 is 7514993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3994157 - 2⁸ = 3993901 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3994157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3994147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86807 + ... + 86852.

It is an arithmetic number, because the mean of its divisors is an integer number (1041960).

Almost surely, 2^3994157 is an apocalyptic number.

It is an amenable number.

3994157 is a deficient number, since it is larger than the sum of its proper divisors (173683).

3994157 is a wasteful number, since it uses less digits than its factorization.

3994157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173682.

The product of its digits is 34020, while the sum is 38.

The square root of 3994157 is about 1998.5387161624. The cubic root of 3994157 is about 158.6627743280.

The spelling of 3994157 in words is "three million, nine hundred ninety-four thousand, one hundred fifty-seven".