213977943 has 40 divisors (see below), whose sum is σ = 338403120. Its totient is φ = 134369280.

The previous prime is 213977941. The next prime is 213977957. The reversal of 213977943 is 349779312.

It is not a de Polignac number, because 213977943 - 2¹ = 213977941 is a prime.

It is a super-2 number, since 2×213977943² = 91573120181022498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213977941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 395253 + ... + 395793.

It is an arithmetic number, because the mean of its divisors is an integer number (8460078).

Almost surely, 2^213977943 is an apocalyptic number.

213977943 is a deficient number, since it is larger than the sum of its proper divisors (124425177).

213977943 is a wasteful number, since it uses less digits than its factorization.

213977943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829 (or 820 counting only the distinct ones).

The product of its digits is 285768, while the sum is 45.

The square root of 213977943 is about 14627.9849261612. The cubic root of 213977943 is about 598.1218520682.

The spelling of 213977943 in words is "two hundred thirteen million, nine hundred seventy-seven thousand, nine hundred forty-three".