1540390 has 16 divisors (see below), whose sum is σ = 2862720. Its totient is φ = 596160.

The previous prime is 1540367. The next prime is 1540403. The reversal of 1540390 is 930451.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2175 + ... + 2794.

It is an arithmetic number, because the mean of its divisors is an integer number (178920).

2^1540390 is an apocalyptic number.

1540390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1540390 is a deficient number, since it is larger than the sum of its proper divisors (1322330).

1540390 is a wasteful number, since it uses less digits than its factorization.

1540390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5007.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 1540390 is about 1241.1244901298. The cubic root of 1540390 is about 115.4897825210.

The spelling of 1540390 in words is "one million, five hundred forty thousand, three hundred ninety".