86690421 has 12 divisors (see below), whose sum is σ = 126460620. Its totient is φ = 57220800.

The previous prime is 86690377. The next prime is 86690423. The reversal of 86690421 is 12409668.

It can be written as a sum of positive squares in 2 ways, for example, as 46049796 + 40640625 = 6786^2 + 6375^2 .

It is not a de Polignac number, because 86690421 - 2¹⁴ = 86674037 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86690423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46776 + ... + 48593.

It is an arithmetic number, because the mean of its divisors is an integer number (10538385).

Almost surely, 2^86690421 is an apocalyptic number.

It is an amenable number.

86690421 is a deficient number, since it is larger than the sum of its proper divisors (39770199).

86690421 is a wasteful number, since it uses less digits than its factorization.

86690421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95476 (or 95473 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 86690421 is about 9310.7690874600. The cubic root of 86690421 is about 442.5785592591.

The spelling of 86690421 in words is "eighty-six million, six hundred ninety thousand, four hundred twenty-one".