3945646 has 4 divisors (see below), whose sum is σ = 5918472. Its totient is φ = 1972822.

The previous prime is 3945631. The next prime is 3945647. The reversal of 3945646 is 6465493.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×3945646³ (a number of 21 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3945647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986410 + ... + 986413.

It is an arithmetic number, because the mean of its divisors is an integer number (1479618).

Almost surely, 2^3945646 is an apocalyptic number.

3945646 is a deficient number, since it is larger than the sum of its proper divisors (1972826).

3945646 is a wasteful number, since it uses less digits than its factorization.

3945646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1972825.

The product of its digits is 77760, while the sum is 37.

The square root of 3945646 is about 1986.3650218427. The cubic root of 3945646 is about 158.0178103087.

The spelling of 3945646 in words is "three million, nine hundred forty-five thousand, six hundred forty-six".