1540664234 has 4 divisors (see below), whose sum is σ = 2310996354. Its totient is φ = 770332116.

The previous prime is 1540664233. The next prime is 1540664297. The reversal of 1540664234 is 4324660451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4324660451 = 53 ⋅81597367.

It can be written as a sum of positive squares in only one way, i.e., 1540170025 + 494209 = 39245^2 + 703^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1540664194 and 1540664203.

It is not an unprimeable number, because it can be changed into a prime (1540664231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385166057 + ... + 385166060.

Almost surely, 2^1540664234 is an apocalyptic number.

1540664234 is a deficient number, since it is larger than the sum of its proper divisors (770332120).

1540664234 is an equidigital number, since it uses as much as digits as its factorization.

1540664234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770332119.

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 1540664234 is about 39251.2959531275. The cubic root of 1540664234 is about 1154.9663562222.

The spelling of 1540664234 in words is "one billion, five hundred forty million, six hundred sixty-four thousand, two hundred thirty-four".