1874380921 has 4 divisors (see below), whose sum is σ = 2142149632. Its totient is φ = 1606612212.

The previous prime is 1874380889. The next prime is 1874380943. The reversal of 1874380921 is 1290834781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1290834781 = 397 ⋅3251473.

It is a cyclic number.

It is not a de Polignac number, because 1874380921 - 2⁵ = 1874380889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1874380021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133884345 + ... + 133884358.

It is an arithmetic number, because the mean of its divisors is an integer number (535537408).

Almost surely, 2^1874380921 is an apocalyptic number.

It is an amenable number.

1874380921 is a deficient number, since it is larger than the sum of its proper divisors (267768711).

1874380921 is an equidigital number, since it uses as much as digits as its factorization.

1874380921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267768710.

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

The square root of 1874380921 is about 43294.1210905130. The cubic root of 1874380921 is about 1232.9703084390.

The spelling of 1874380921 in words is "one billion, eight hundred seventy-four million, three hundred eighty thousand, nine hundred twenty-one".