1540904 has 8 divisors (see below), whose sum is σ = 2889210. Its totient is φ = 770448.

The previous prime is 1540901. The next prime is 1540927. The reversal of 1540904 is 4090451.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1444804 + 96100 = 1202^2 + 310^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 1540904.

It is not an unprimeable number, because it can be changed into a prime (1540901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96299 + ... + 96314.

2^1540904 is an apocalyptic number.

It is an amenable number.

1540904 is a deficient number, since it is larger than the sum of its proper divisors (1348306).

1540904 is a wasteful number, since it uses less digits than its factorization.

1540904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192619 (or 192615 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1540904 is about 1241.3315431423. The cubic root of 1540904 is about 115.5026267026.

The spelling of 1540904 in words is "one million, five hundred forty thousand, nine hundred four".