216738407 has 16 divisors (see below), whose sum is σ = 230973120. Its totient is φ = 202954752.

The previous prime is 216738371. The next prime is 216738419. The reversal of 216738407 is 704837612.

It is a cyclic number.

It is not a de Polignac number, because 216738407 - 2¹⁰ = 216737383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216738427) 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, 230843 + ... + 231779.

It is an arithmetic number, because the mean of its divisors is an integer number (14435820).

Almost surely, 2^216738407 is an apocalyptic number.

216738407 is a deficient number, since it is larger than the sum of its proper divisors (14234713).

216738407 is a wasteful number, since it uses less digits than its factorization.

216738407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 216738407 is about 14722.0381401489. The cubic root of 216738407 is about 600.6829325621.

The spelling of 216738407 in words is "two hundred sixteen million, seven hundred thirty-eight thousand, four hundred seven".