1540004 has 6 divisors (see below), whose sum is σ = 2695014. Its totient is φ = 770000.

The previous prime is 1540003. The next prime is 1540009. The reversal of 1540004 is 4000451.

It can be written as a sum of positive squares in only one way, i.e., 1416100 + 123904 = 1190^2 + 352^2 .

It is a super-2 number, since 2×1540004² = 4743224640032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1540003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192497 + ... + 192504.

It is an arithmetic number, because the mean of its divisors is an integer number (449169).

2^1540004 is an apocalyptic number.

It is an amenable number.

1540004 is a deficient number, since it is larger than the sum of its proper divisors (1155010).

1540004 is a wasteful number, since it uses less digits than its factorization.

1540004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385005 (or 385003 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 1540004 is about 1240.9689762440. The cubic root of 1540004 is about 115.4801350118.

Adding to 1540004 its reverse (4000451), we get a palindrome (5540455).

It can be divided in two parts, 15 and 40004, that multiplied together give a triangular number (600060 = T₁₀₉₅).

The spelling of 1540004 in words is "one million, five hundred forty thousand, four".