71909402 has 4 divisors (see below), whose sum is σ = 107864106. Its totient is φ = 35954700.

The previous prime is 71909401. The next prime is 71909417. The reversal of 71909402 is 20490917.

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., 46799281 + 25110121 = 6841^2 + 5011^2 .

It is not an unprimeable number, because it can be changed into a prime (71909401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17977349 + ... + 17977352.

Almost surely, 2^71909402 is an apocalyptic number.

71909402 is a deficient number, since it is larger than the sum of its proper divisors (35954704).

71909402 is a wasteful number, since it uses less digits than its factorization.

71909402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35954703.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 71909402 is about 8479.9411554562. The cubic root of 71909402 is about 415.8421993024.

The spelling of 71909402 in words is "seventy-one million, nine hundred nine thousand, four hundred two".