85440007 has 2 divisors, whose sum is σ = 85440008. Its totient is φ = 85440006.

The previous prime is 85439989. The next prime is 85440013. The reversal of 85440007 is 70004458.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85440007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85440107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42720003 + 42720004.

It is an arithmetic number, because the mean of its divisors is an integer number (42720004).

Almost surely, 2^85440007 is an apocalyptic number.

85440007 is a deficient number, since it is larger than the sum of its proper divisors (1).

85440007 is an equidigital number, since it uses as much as digits as its factorization.

85440007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 85440007 is about 9243.3763852826. The cubic root of 85440007 is about 440.4403425698.

The spelling of 85440007 in words is "eighty-five million, four hundred forty thousand, seven".