1880721394 has 4 divisors (see below), whose sum is σ = 2821082094. Its totient is φ = 940360696.

The previous prime is 1880721391. The next prime is 1880721413. The reversal of 1880721394 is 4931270881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4931270881 = 673 ⋅7327297.

It can be written as a sum of positive squares in only one way, i.e., 1390320369 + 490401025 = 37287^2 + 22145^2 .

It is a super-2 number, since 2×1880721394² = 7074225923698606472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1880721394.

It is not an unprimeable number, because it can be changed into a prime (1880721391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 470180347 + ... + 470180350.

Almost surely, 2^1880721394 is an apocalyptic number.

1880721394 is a deficient number, since it is larger than the sum of its proper divisors (940360700).

1880721394 is an equidigital number, since it uses as much as digits as its factorization.

1880721394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940360699.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 1880721394 is about 43367.2848354609. The cubic root of 1880721394 is about 1234.3590010117.

The spelling of 1880721394 in words is "one billion, eight hundred eighty million, seven hundred twenty-one thousand, three hundred ninety-four".