1231240 has 16 divisors (see below), whose sum is σ = 2770380. Its totient is φ = 492480.

The previous prime is 1231231. The next prime is 1231247. The reversal of 1231240 is 421321.

1231240 = T₇₉ + T₈₀ + ... + T₁₉₈.

It can be written as a sum of positive squares in 2 ways, for example, as 1170724 + 60516 = 1082^2 + 246^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1231240.

It is not an unprimeable number, because it can be changed into a prime (1231247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15351 + ... + 15430.

2^1231240 is an apocalyptic number.

1231240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231240 is an abundant number, since it is smaller than the sum of its proper divisors (1539140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231240 is a wasteful number, since it uses less digits than its factorization.

1231240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30792 (or 30788 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1231240 is about 1109.6125449904. The cubic root of 1231240 is about 107.1801199491.

Adding to 1231240 its reverse (421321), we get a palindrome (1652561).

The spelling of 1231240 in words is "one million, two hundred thirty-one thousand, two hundred forty".