216739390 has 16 divisors (see below), whose sum is σ = 445864032. Its totient is φ = 74310624.

The previous prime is 216739387. The next prime is 216739421. The reversal of 216739390 is 93937612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1548069 + ... + 1548208.

It is an arithmetic number, because the mean of its divisors is an integer number (27866502).

Almost surely, 2^216739390 is an apocalyptic number.

216739390 is an abundant number, since it is smaller than the sum of its proper divisors (229124642).

216739390 is a wasteful number, since it uses less digits than its factorization.

216739390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3096291.

The product of its (nonzero) digits is 61236, while the sum is 40.

The square root of 216739390 is about 14722.0715254342. The cubic root of 216739390 is about 600.6838406775.

The spelling of 216739390 in words is "two hundred sixteen million, seven hundred thirty-nine thousand, three hundred ninety".