1863898213 has 4 divisors (see below), whose sum is σ = 1864033408. Its totient is φ = 1863763020.

The previous prime is 1863898159. The next prime is 1863898217. The reversal of 1863898213 is 3128983681.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3128983681 = 29 ⋅107895989.

It is a cyclic number.

It is not a de Polignac number, because 1863898213 - 2²¹ = 1861801061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1863898217) 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, 44223 + ... + 75388.

It is an arithmetic number, because the mean of its divisors is an integer number (466008352).

Almost surely, 2^1863898213 is an apocalyptic number.

It is an amenable number.

1863898213 is a deficient number, since it is larger than the sum of its proper divisors (135195).

1863898213 is a wasteful number, since it uses less digits than its factorization.

1863898213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135194.

The product of its digits is 497664, while the sum is 49.

The square root of 1863898213 is about 43172.8874758221. The cubic root of 1863898213 is about 1230.6674969958.

The spelling of 1863898213 in words is "one billion, eight hundred sixty-three million, eight hundred ninety-eight thousand, two hundred thirteen".