1540890673 has 4 divisors (see below), whose sum is σ = 1761017920. Its totient is φ = 1320763428.

The previous prime is 1540890607. The next prime is 1540890691. The reversal of 1540890673 is 3760980451.

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: 3760980451 = 233 ⋅16141547.

It is a cyclic number.

It is not a de Polignac number, because 1540890673 - 2¹³ = 1540882481 is a prime.

It is a super-2 number, since 2×1540890673² = 4748688132276785858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1540890173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110063613 + ... + 110063626.

It is an arithmetic number, because the mean of its divisors is an integer number (440254480).

Almost surely, 2^1540890673 is an apocalyptic number.

It is an amenable number.

1540890673 is a deficient number, since it is larger than the sum of its proper divisors (220127247).

1540890673 is an equidigital number, since it uses as much as digits as its factorization.

1540890673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220127246.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 1540890673 is about 39254.1803251577. The cubic root of 1540890673 is about 1155.0229371456.

The spelling of 1540890673 in words is "one billion, five hundred forty million, eight hundred ninety thousand, six hundred seventy-three".