1878364634 has 4 divisors (see below), whose sum is σ = 2817546954. Its totient is φ = 939182316.

The previous prime is 1878364619. The next prime is 1878364637. The reversal of 1878364634 is 4364638781.

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., 1398535609 + 479829025 = 37397^2 + 21905^2 .

It is not an unprimeable number, because it can be changed into a prime (1878364637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 469591157 + ... + 469591160.

Almost surely, 2^1878364634 is an apocalyptic number.

1878364634 is a deficient number, since it is larger than the sum of its proper divisors (939182320).

1878364634 is an equidigital number, since it uses as much as digits as its factorization.

1878364634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939182319.

The product of its digits is 2322432, while the sum is 50.

The square root of 1878364634 is about 43340.1042223020. The cubic root of 1878364634 is about 1233.8431876088.

The spelling of 1878364634 in words is "one billion, eight hundred seventy-eight million, three hundred sixty-four thousand, six hundred thirty-four".