42985906 has 4 divisors (see below), whose sum is σ = 64478862. Its totient is φ = 21492952.

The previous prime is 42985879. The next prime is 42985951. The reversal of 42985906 is 60958924.

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

It can be written as a sum of positive squares in only one way, i.e., 33120025 + 9865881 = 5755^2 + 3141^2 .

It is a super-2 number, since 2×42985906² = 3695576229281672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10746475 + ... + 10746478.

Almost surely, 2^42985906 is an apocalyptic number.

42985906 is a deficient number, since it is larger than the sum of its proper divisors (21492956).

42985906 is a wasteful number, since it uses less digits than its factorization.

42985906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21492955.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 42985906 is about 6556.3637788030. The cubic root of 42985906 is about 350.3015251953.

The spelling of 42985906 in words is "forty-two million, nine hundred eighty-five thousand, nine hundred six".