70040909 has 4 divisors (see below), whose sum is σ = 70243104. Its totient is φ = 69838716.

The previous prime is 70040899. The next prime is 70040917. The reversal of 70040909 is 90904007.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90904007 = 83 ⋅1095229.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70040909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70040959) 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, 100577 + ... + 101270.

It is an arithmetic number, because the mean of its divisors is an integer number (17560776).

Almost surely, 2^70040909 is an apocalyptic number.

It is an amenable number.

70040909 is a deficient number, since it is larger than the sum of its proper divisors (202195).

70040909 is a wasteful number, since it uses less digits than its factorization.

70040909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202194.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 70040909 is about 8369.0446886129. The cubic root of 70040909 is about 412.2087989463.

The spelling of 70040909 in words is "seventy million, forty thousand, nine hundred nine".