213956487 has 12 divisors (see below), whose sum is σ = 312772824. Its totient is φ = 140918640.

The previous prime is 213956453. The next prime is 213956507. The reversal of 213956487 is 784659312.

213956487 is a `hidden beast` number, since 2 + 1 + 3 + 9 + 564 + 87 = 666.

213956487 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213956487 - 2⁶ = 213956423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213956437) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142464 + ... + 143957.

It is an arithmetic number, because the mean of its divisors is an integer number (26064402).

Almost surely, 2^213956487 is an apocalyptic number.

213956487 is a deficient number, since it is larger than the sum of its proper divisors (98816337).

213956487 is a wasteful number, since it uses less digits than its factorization.

213956487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286510 (or 286507 counting only the distinct ones).

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

The square root of 213956487 is about 14627.2515189970. The cubic root of 213956487 is about 598.1018597718.

The spelling of 213956487 in words is "two hundred thirteen million, nine hundred fifty-six thousand, four hundred eighty-seven".