1899440456 has 32 divisors (see below), whose sum is σ = 3652538400. Its totient is φ = 925484160.

The previous prime is 1899440453. The next prime is 1899440461. The reversal of 1899440456 is 6540449981.

It is not an unprimeable number, because it can be changed into a prime (1899440453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331391 + ... + 337073.

It is an arithmetic number, because the mean of its divisors is an integer number (114141825).

Almost surely, 2^1899440456 is an apocalyptic number.

It is an amenable number.

1899440456 is a deficient number, since it is larger than the sum of its proper divisors (1753097944).

1899440456 is a wasteful number, since it uses less digits than its factorization.

1899440456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6749 (or 6745 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 50.

The square root of 1899440456 is about 43582.5705529171. The cubic root of 1899440456 is about 1238.4407334612.

The spelling of 1899440456 in words is "one billion, eight hundred ninety-nine million, four hundred forty thousand, four hundred fifty-six".