1540668 has 12 divisors (see below), whose sum is σ = 3594920. Its totient is φ = 513552.

The previous prime is 1540661. The next prime is 1540673. The reversal of 1540668 is 8660451.

It is a tau number, because it is divible by the number of its divisors (12).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540661) 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, 64183 + ... + 64206.

2^1540668 is an apocalyptic number.

It is an amenable number.

1540668 is an abundant number, since it is smaller than the sum of its proper divisors (2054252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1540668 is a wasteful number, since it uses less digits than its factorization.

1540668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128396 (or 128394 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1540668 is about 1241.2364802889. The cubic root of 1540668 is about 115.4967297288.

The spelling of 1540668 in words is "one million, five hundred forty thousand, six hundred sixty-eight".