985708621 has 4 divisors (see below), whose sum is σ = 985803552. Its totient is φ = 985613692.

The previous prime is 985708589. The next prime is 985708639. The reversal of 985708621 is 126807589.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 126807589 = 2797 ⋅45337.

It is a cyclic number.

It is not a de Polignac number, because 985708621 - 2⁵ = 985708589 is a prime.

It is a super-4 number, since 4×985708621⁴ (a number of 37 digits) contains 4444 as substring.

It is a deceptive number, since it divides R_985708620.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985708121) 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, 29665 + ... + 53398.

It is an arithmetic number, because the mean of its divisors is an integer number (246450888).

Almost surely, 2^985708621 is an apocalyptic number.

It is an amenable number.

985708621 is a deficient number, since it is larger than the sum of its proper divisors (94931).

985708621 is a wasteful number, since it uses less digits than its factorization.

985708621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94930.

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 985708621 is about 31395.9968945087. The cubic root of 985708621 is about 995.2133313610.

The spelling of 985708621 in words is "nine hundred eighty-five million, seven hundred eight thousand, six hundred twenty-one".