1899743401 has 4 divisors (see below), whose sum is σ = 1899878400. Its totient is φ = 1899608404.

The previous prime is 1899743389. The next prime is 1899743407. The reversal of 1899743401 is 1043479981.

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.

It is a cyclic number.

It is not a de Polignac number, because 1899743401 - 2⁵ = 1899743369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1899743407) 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, 43561 + ... + 75478.

It is an arithmetic number, because the mean of its divisors is an integer number (474969600).

Almost surely, 2^1899743401 is an apocalyptic number.

It is an amenable number.

1899743401 is a deficient number, since it is larger than the sum of its proper divisors (134999).

1899743401 is a wasteful number, since it uses less digits than its factorization.

1899743401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134998.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 1899743401 is about 43586.0459436274. The cubic root of 1899743401 is about 1238.5065703033.

The spelling of 1899743401 in words is "one billion, eight hundred ninety-nine million, seven hundred forty-three thousand, four hundred one".