1866950398 has 4 divisors (see below), whose sum is σ = 2800425600. Its totient is φ = 933475198.

The previous prime is 1866950381. The next prime is 1866950401. The reversal of 1866950398 is 8930596681.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8930596681 = 569 ⋅15695249.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 466737598 + ... + 466737601.

It is an arithmetic number, because the mean of its divisors is an integer number (700106400).

Almost surely, 2^1866950398 is an apocalyptic number.

1866950398 is a deficient number, since it is larger than the sum of its proper divisors (933475202).

1866950398 is an equidigital number, since it uses as much as digits as its factorization.

1866950398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933475201.

The product of its (nonzero) digits is 2799360, while the sum is 55.

The square root of 1866950398 is about 43208.2214167628. The cubic root of 1866950398 is about 1231.3388813743.

The spelling of 1866950398 in words is "one billion, eight hundred sixty-six million, nine hundred fifty thousand, three hundred ninety-eight".