213487965 has 24 divisors (see below), whose sum is σ = 380050008. Its totient is φ = 110782080.

The previous prime is 213487961. The next prime is 213487969. The reversal of 213487965 is 569784312.

It is an interprime number because it is at equal distance from previous prime (213487961) and next prime (213487969).

It can be written as a sum of positive squares in 4 ways, for example, as 57062916 + 156425049 = 7554^2 + 12507^2 .

It is not a de Polignac number, because 213487965 - 2² = 213487961 is a prime.

It is a super-2 number, since 2×213487965² = 91154222399682450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 213487965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213487961) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62446 + ... + 65775.

It is an arithmetic number, because the mean of its divisors is an integer number (15835417).

Almost surely, 2^213487965 is an apocalyptic number.

It is an amenable number.

213487965 is a deficient number, since it is larger than the sum of its proper divisors (166562043).

213487965 is a wasteful number, since it uses less digits than its factorization.

213487965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128269 (or 128266 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 213487965 is about 14611.2273611767. The cubic root of 213487965 is about 597.6649661500.

The spelling of 213487965 in words is "two hundred thirteen million, four hundred eighty-seven thousand, nine hundred sixty-five".