1240023405 has 16 divisors (see below), whose sum is σ = 2048039424. Its totient is φ = 640011840.

The previous prime is 1240023373. The next prime is 1240023409. The reversal of 1240023405 is 5043200421.

It is not a de Polignac number, because 1240023405 - 2⁵ = 1240023373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240023409) 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, 1332894 + ... + 1333823.

It is an arithmetic number, because the mean of its divisors is an integer number (128002464).

Almost surely, 2^1240023405 is an apocalyptic number.

1240023405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1240023405 is a deficient number, since it is larger than the sum of its proper divisors (808016019).

1240023405 is a wasteful number, since it uses less digits than its factorization.

1240023405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2666756.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 1240023405 is about 35213.9660504181. The cubic root of 1240023405 is about 1074.3438303172.

Adding to 1240023405 its reverse (5043200421), we get a palindrome (6283223826).

The spelling of 1240023405 in words is "one billion, two hundred forty million, twenty-three thousand, four hundred five".