213977944 has 8 divisors (see below), whose sum is σ = 401208660. Its totient is φ = 106988968.

The previous prime is 213977941. The next prime is 213977957. The reversal of 213977944 is 449779312.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 213977894 and 213977903.

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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13373614 + ... + 13373629.

Almost surely, 2^213977944 is an apocalyptic number.

It is an amenable number.

213977944 is a deficient number, since it is larger than the sum of its proper divisors (187230716).

213977944 is a wasteful number, since it uses less digits than its factorization.

213977944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26747249 (or 26747245 counting only the distinct ones).

The product of its digits is 381024, while the sum is 46.

The square root of 213977944 is about 14627.9849603423. The cubic root of 213977944 is about 598.1218530000.

The spelling of 213977944 in words is "two hundred thirteen million, nine hundred seventy-seven thousand, nine hundred forty-four".