1905400353 has 4 divisors (see below), whose sum is σ = 2540533808. Its totient is φ = 1270266900.

The previous prime is 1905400349. The next prime is 1905400363. The reversal of 1905400353 is 3530045091.

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: 3530045091 = 3 ⋅1176681697.

It is not a de Polignac number, because 1905400353 - 2² = 1905400349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1905400353.

It is not an unprimeable number, because it can be changed into a prime (1905400303) 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, 317566723 + ... + 317566728.

It is an arithmetic number, because the mean of its divisors is an integer number (635133452).

Almost surely, 2^1905400353 is an apocalyptic number.

It is an amenable number.

1905400353 is a deficient number, since it is larger than the sum of its proper divisors (635133455).

1905400353 is an equidigital number, since it uses as much as digits as its factorization.

1905400353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635133454.

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 1905400353 is about 43650.8917778320. The cubic root of 1905400353 is about 1239.7346711613.

The spelling of 1905400353 in words is "one billion, nine hundred five million, four hundred thousand, three hundred fifty-three".