213701405 has 8 divisors (see below), whose sum is σ = 256905432. Its totient is φ = 170651968.

The previous prime is 213701393. The next prime is 213701431. The reversal of 213701405 is 504107312.

It can be written as a sum of positive squares in 4 ways, for example, as 42954916 + 170746489 = 6554^2 + 13067^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213701405 - 2¹⁶ = 213635869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a Zeisel number, with parameters (138, -133).

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35582 + ... + 41151.

It is an arithmetic number, because the mean of its divisors is an integer number (32113179).

Almost surely, 2^213701405 is an apocalyptic number.

It is an amenable number.

213701405 is a deficient number, since it is larger than the sum of its proper divisors (43204027).

213701405 is an equidigital number, since it uses as much as digits as its factorization.

213701405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77295.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 213701405 is about 14618.5295088118. The cubic root of 213701405 is about 597.8640767051.

Adding to 213701405 its reverse (504107312), we get a palindrome (717808717).

The spelling of 213701405 in words is "two hundred thirteen million, seven hundred one thousand, four hundred five".