85442437 has 4 divisors (see below), whose sum is σ = 85606956. Its totient is φ = 85277920.

The previous prime is 85442431. The next prime is 85442471. The reversal of 85442437 is 73424458.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17313921 + 68128516 = 4161^2 + 8254^2 .

It is a cyclic number.

It is not a de Polignac number, because 85442437 - 2³ = 85442429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85442396 and 85442405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85442431) 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, 81478 + ... + 82519.

It is an arithmetic number, because the mean of its divisors is an integer number (21401739).

Almost surely, 2^85442437 is an apocalyptic number.

It is an amenable number.

85442437 is a deficient number, since it is larger than the sum of its proper divisors (164519).

85442437 is a wasteful number, since it uses less digits than its factorization.

85442437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164518.

The product of its digits is 107520, while the sum is 37.

The square root of 85442437 is about 9243.5078298230. The cubic root of 85442437 is about 440.4445180528. Note that the first 3 decimals are identical.

It can be divided in two parts, 8 and 5442437, that added together give a palindrome (5442445).

The spelling of 85442437 in words is "eighty-five million, four hundred forty-two thousand, four hundred thirty-seven".