3997642 has 8 divisors (see below), whose sum is σ = 6541632. Its totient is φ = 1817100.

The previous prime is 3997639. The next prime is 3997649. The reversal of 3997642 is 2467993.

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

It is a super-2 number, since 2×3997642² = 31962283120328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3997595 and 3997604.

It is not an unprimeable number, because it can be changed into a prime (3997649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90834 + ... + 90877.

It is an arithmetic number, because the mean of its divisors is an integer number (817704).

Almost surely, 2^3997642 is an apocalyptic number.

3997642 is a deficient number, since it is larger than the sum of its proper divisors (2543990).

3997642 is a wasteful number, since it uses less digits than its factorization.

3997642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181724.

The product of its digits is 81648, while the sum is 40.

The square root of 3997642 is about 1999.4104130968. The cubic root of 3997642 is about 158.7089066348.

The spelling of 3997642 in words is "three million, nine hundred ninety-seven thousand, six hundred forty-two".