216986739 has 16 divisors (see below), whose sum is σ = 292884480. Its totient is φ = 142884000.

The previous prime is 216986711. The next prime is 216986743. The reversal of 216986739 is 937689612.

It is a de Polignac number, because none of the positive numbers 2^k-216986739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216986691 and 216986700.

It is not an unprimeable number, because it can be changed into a prime (216986779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94497 + ... + 96765.

It is an arithmetic number, because the mean of its divisors is an integer number (18305280).

Almost surely, 2^216986739 is an apocalyptic number.

216986739 is a deficient number, since it is larger than the sum of its proper divisors (75897741).

216986739 is a wasteful number, since it uses less digits than its factorization.

216986739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2650.

The product of its digits is 979776, while the sum is 51.

The square root of 216986739 is about 14730.4697481105. The cubic root of 216986739 is about 600.9122594903.

The spelling of 216986739 in words is "two hundred sixteen million, nine hundred eighty-six thousand, seven hundred thirty-nine".