42690826 has 4 divisors (see below), whose sum is σ = 64036242. Its totient is φ = 21345412.

The previous prime is 42690803. The next prime is 42690827. The reversal of 42690826 is 62809624.

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., 36614601 + 6076225 = 6051^2 + 2465^2 .

It is not an unprimeable number, because it can be changed into a prime (42690827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672705 + ... + 10672708.

Almost surely, 2^42690826 is an apocalyptic number.

42690826 is a deficient number, since it is larger than the sum of its proper divisors (21345416).

42690826 is a wasteful number, since it uses less digits than its factorization.

42690826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21345415.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 42690826 is about 6533.8216994344. The cubic root of 42690826 is about 349.4981269552.

The spelling of 42690826 in words is "forty-two million, six hundred ninety thousand, eight hundred twenty-six".