1540215 has 20 divisors (see below), whose sum is σ = 2761704. Its totient is φ = 821232.

The previous prime is 1540211. The next prime is 1540223. The reversal of 1540215 is 5120451.

It is not a de Polignac number, because 1540215 - 2² = 1540211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1497 + ... + 2306.

2^1540215 is an apocalyptic number.

1540215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1540215 is a deficient number, since it is larger than the sum of its proper divisors (1221489).

1540215 is an equidigital number, since it uses as much as digits as its factorization.

1540215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3820 (or 3811 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 1540215 is about 1241.0539875445. The cubic root of 1540215 is about 115.4854088500.

Adding to 1540215 its reverse (5120451), we get a palindrome (6660666).

The spelling of 1540215 in words is "one million, five hundred forty thousand, two hundred fifteen".