70021838 has 4 divisors (see below), whose sum is σ = 105032760. Its totient is φ = 35010918.

The previous prime is 70021837. The next prime is 70021949. The reversal of 70021838 is 83812007.

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

It is a self number, because there is not a number n which added to its sum of digits gives 70021838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70021837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17505458 + ... + 17505461.

It is an arithmetic number, because the mean of its divisors is an integer number (26258190).

Almost surely, 2^70021838 is an apocalyptic number.

70021838 is a deficient number, since it is larger than the sum of its proper divisors (35010922).

70021838 is a wasteful number, since it uses less digits than its factorization.

70021838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35010921.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 70021838 is about 8367.9052336890. The cubic root of 70021838 is about 412.1713829669.

The spelling of 70021838 in words is "seventy million, twenty-one thousand, eight hundred thirty-eight".