1640143454 has 8 divisors (see below), whose sum is σ = 2474436600. Its totient is φ = 815331256.

The previous prime is 1640143429. The next prime is 1640143457. The reversal of 1640143454 is 4543410461.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1640143454.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640143457) 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, 2369804 + ... + 2370495.

It is an arithmetic number, because the mean of its divisors is an integer number (309304575).

Almost surely, 2^1640143454 is an apocalyptic number.

1640143454 is a deficient number, since it is larger than the sum of its proper divisors (834293146).

1640143454 is a wasteful number, since it uses less digits than its factorization.

1640143454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4740474.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 1640143454 is about 40498.6845959224. The cubic root of 1640143454 is about 1179.3080914490.

The spelling of 1640143454 in words is "one billion, six hundred forty million, one hundred forty-three thousand, four hundred fifty-four".