85181438 has 4 divisors (see below), whose sum is σ = 127772160. Its totient is φ = 42590718.

The previous prime is 85181431. The next prime is 85181501. The reversal of 85181438 is 83418158.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85181431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21295358 + ... + 21295361.

It is an arithmetic number, because the mean of its divisors is an integer number (31943040).

Almost surely, 2^85181438 is an apocalyptic number.

85181438 is a deficient number, since it is larger than the sum of its proper divisors (42590722).

85181438 is a wasteful number, since it uses less digits than its factorization.

85181438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42590721.

The product of its digits is 30720, while the sum is 38.

The square root of 85181438 is about 9229.3790690382. The cubic root of 85181438 is about 439.9955887988.

The spelling of 85181438 in words is "eighty-five million, one hundred eighty-one thousand, four hundred thirty-eight".