1857216534 has 16 divisors (see below), whose sum is σ = 3715476480. Its totient is φ = 618898280.

The previous prime is 1857216533. The next prime is 1857216547. The reversal of 1857216534 is 4356127581.

It is a happy number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1857216533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19302 + ... + 63929.

It is an arithmetic number, because the mean of its divisors is an integer number (232217280).

Almost surely, 2^1857216534 is an apocalyptic number.

1857216534 is an abundant number, since it is smaller than the sum of its proper divisors (1858259946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1857216534 is a wasteful number, since it uses less digits than its factorization.

1857216534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86955.

The product of its digits is 201600, while the sum is 42.

The square root of 1857216534 is about 43095.4351874998. The cubic root of 1857216534 is about 1229.1951757889.

The spelling of 1857216534 in words is "one billion, eight hundred fifty-seven million, two hundred sixteen thousand, five hundred thirty-four".