42979649 has 4 divisors (see below), whose sum is σ = 42995136. Its totient is φ = 42964164.

The previous prime is 42979639. The next prime is 42979669. The reversal of 42979649 is 94697924.

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 42979649 - 2²⁰ = 41931073 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42979597 and 42979606.

It is not an unprimeable number, because it can be changed into a prime (42979619) 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, 2309 + ... + 9554.

It is an arithmetic number, because the mean of its divisors is an integer number (10748784).

Almost surely, 2^42979649 is an apocalyptic number.

It is an amenable number.

42979649 is a deficient number, since it is larger than the sum of its proper divisors (15487).

42979649 is a wasteful number, since it uses less digits than its factorization.

42979649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15486.

The product of its digits is 979776, while the sum is 50.

The square root of 42979649 is about 6555.8865914535. The cubic root of 42979649 is about 350.2845278179.

The spelling of 42979649 in words is "forty-two million, nine hundred seventy-nine thousand, six hundred forty-nine".