213998977 has 4 divisors (see below), whose sum is σ = 215280576. Its totient is φ = 212717380.

The previous prime is 213998909. The next prime is 213998999. The reversal of 213998977 is 779899312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213998977 - 2¹⁹ = 213474689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213998077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640549 + ... + 640882.

It is an arithmetic number, because the mean of its divisors is an integer number (53820144).

Almost surely, 2^213998977 is an apocalyptic number.

It is an amenable number.

213998977 is a deficient number, since it is larger than the sum of its proper divisors (1281599).

213998977 is a wasteful number, since it uses less digits than its factorization.

213998977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281598.

The product of its digits is 1714608, while the sum is 55.

The square root of 213998977 is about 14628.7038728658. The cubic root of 213998977 is about 598.1414498558.

The spelling of 213998977 in words is "two hundred thirteen million, nine hundred ninety-eight thousand, nine hundred seventy-seven".