1640254123 has 8 divisors (see below), whose sum is σ = 1728831600. Its totient is φ = 1553811168.

The previous prime is 1640254093. The next prime is 1640254139. The reversal of 1640254123 is 3214520461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640254123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1640254091 and 1640254100.

It is not an unprimeable number, because it can be changed into a prime (1640254153) 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, 532053 + ... + 535126.

It is an arithmetic number, because the mean of its divisors is an integer number (216103950).

Almost surely, 2^1640254123 is an apocalyptic number.

1640254123 is a deficient number, since it is larger than the sum of its proper divisors (88577477).

1640254123 is a wasteful number, since it uses less digits than its factorization.

1640254123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067261.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 1640254123 is about 40500.0509012026. The cubic root of 1640254123 is about 1179.3346155337.

Adding to 1640254123 its reverse (3214520461), we get a palindrome (4854774584).

The spelling of 1640254123 in words is "one billion, six hundred forty million, two hundred fifty-four thousand, one hundred twenty-three".