2151842386 has 4 divisors (see below), whose sum is σ = 3227763582. Its totient is φ = 1075921192.

The previous prime is 2151842377. The next prime is 2151842387. The reversal of 2151842386 is 6832481512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2083466025 + 68376361 = 45645^2 + 8269^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2151842387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 537960595 + ... + 537960598.

Almost surely, 2^2151842386 is an apocalyptic number.

2151842386 is a deficient number, since it is larger than the sum of its proper divisors (1075921196).

2151842386 is a wasteful number, since it uses less digits than its factorization.

2151842386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075921195.

The product of its digits is 92160, while the sum is 40.

The square root of 2151842386 is about 46387.9551823531. The cubic root of 2151842386 is about 1291.0314419638.

The spelling of 2151842386 in words is "two billion, one hundred fifty-one million, eight hundred forty-two thousand, three hundred eighty-six".