215385077 has 4 divisors (see below), whose sum is σ = 216674976. Its totient is φ = 214095180.

The previous prime is 215385043. The next prime is 215385143. The reversal of 215385077 is 770583512.

It is a happy number.

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 215385077 - 2¹⁴ = 215368693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215385077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215385377) 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, 644699 + ... + 645032.

It is an arithmetic number, because the mean of its divisors is an integer number (54168744).

Almost surely, 2^215385077 is an apocalyptic number.

It is an amenable number.

215385077 is a deficient number, since it is larger than the sum of its proper divisors (1289899).

215385077 is a wasteful number, since it uses less digits than its factorization.

215385077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289898.

The product of its (nonzero) digits is 58800, while the sum is 38.

The square root of 215385077 is about 14676.0034409917. The cubic root of 215385077 is about 599.4300856860.

The spelling of 215385077 in words is "two hundred fifteen million, three hundred eighty-five thousand, seventy-seven".