1231538 has 24 divisors (see below), whose sum is σ = 2323776. Its totient is φ = 479160.

The previous prime is 1231513. The next prime is 1231547. The reversal of 1231538 is 8351321.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1331 + ... + 2057.

It is an arithmetic number, because the mean of its divisors is an integer number (96824).

2^1231538 is an apocalyptic number.

1231538 is a deficient number, since it is larger than the sum of its proper divisors (1092238).

1231538 is a wasteful number, since it uses less digits than its factorization.

1231538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758 (or 747 counting only the distinct ones).

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

The square root of 1231538 is about 1109.7468179725. The cubic root of 1231538 is about 107.1887662729.

Adding to 1231538 its reverse (8351321), we get a palindrome (9582859).

It can be divided in two parts, 123 and 1538, that added together give a palindrome (1661).

The spelling of 1231538 in words is "one million, two hundred thirty-one thousand, five hundred thirty-eight".