1240920231 has 4 divisors (see below), whose sum is σ = 1654560312. Its totient is φ = 827280152.

The previous prime is 1240920209. The next prime is 1240920251. The reversal of 1240920231 is 1320290421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1320290421 = 3 ⋅440096807.

It is a cyclic number.

It is not a de Polignac number, because 1240920231 - 2⁷ = 1240920103 is a prime.

It is a super-2 number, since 2×1240920231² = 3079766039410186722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240920251) 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, 206820036 + ... + 206820041.

It is an arithmetic number, because the mean of its divisors is an integer number (413640078).

Almost surely, 2^1240920231 is an apocalyptic number.

1240920231 is a deficient number, since it is larger than the sum of its proper divisors (413640081).

1240920231 is an equidigital number, since it uses as much as digits as its factorization.

1240920231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413640080.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1240920231 is about 35226.6977021690. The cubic root of 1240920231 is about 1074.6027682510.

It can be divided in two parts, 12409 and 20231, that added together give a triangular number (32640 = T₂₅₅).

The spelling of 1240920231 in words is "one billion, two hundred forty million, nine hundred twenty thousand, two hundred thirty-one".