1540231 has 16 divisors (see below), whose sum is σ = 1951488. Its totient is φ = 1180800.

The previous prime is 1540229. The next prime is 1540243. The reversal of 1540231 is 1320451.

It is a cyclic number.

It is not a de Polignac number, because 1540231 - 2¹ = 1540229 is a prime.

It is a super-2 number, since 2×1540231² = 4744623066722, which contains 22 as substring.

1540231 is a modest number, since divided by 231 gives 154 as remainder.

It is a nialpdrome in base 11.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6271 + ... + 6511.

It is an arithmetic number, because the mean of its divisors is an integer number (121968).

2^1540231 is an apocalyptic number.

1540231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1540231 is a deficient number, since it is larger than the sum of its proper divisors (411257).

1540231 is a wasteful number, since it uses less digits than its factorization.

1540231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 1540231 is about 1241.0604336615. The cubic root of 1540231 is about 115.4858087422.

Adding to 1540231 its reverse (1320451), we get a palindrome (2860682).

It can be divided in two parts, 1540 and 231, that added together give a palindrome (1771).

The spelling of 1540231 in words is "one million, five hundred forty thousand, two hundred thirty-one".