1780394213 has 12 divisors (see below), whose sum is σ = 1944964260. Its totient is φ = 1628879616.

The previous prime is 1780394177. The next prime is 1780394219. The reversal of 1780394213 is 3124930871.

It can be written as a sum of positive squares in 6 ways, for example, as 367987489 + 1412406724 = 19183^2 + 37582^2 .

It is not a de Polignac number, because 1780394213 - 2⁸ = 1780393957 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1780394219) 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, 27518 + ... + 65711.

It is an arithmetic number, because the mean of its divisors is an integer number (162080355).

Almost surely, 2^1780394213 is an apocalyptic number.

1780394213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1780394213 is a deficient number, since it is larger than the sum of its proper divisors (164570047).

1780394213 is a wasteful number, since it uses less digits than its factorization.

1780394213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93368 (or 93355 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 1780394213 is about 42194.7178329231. The cubic root of 1780394213 is about 1212.0077345319.

The spelling of 1780394213 in words is "one billion, seven hundred eighty million, three hundred ninety-four thousand, two hundred thirteen".