1240156402 has 8 divisors (see below), whose sum is σ = 1860897456. Its totient is φ = 619857252.

The previous prime is 1240156373. The next prime is 1240156403. The reversal of 1240156402 is 2046510421.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1240156403) 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, 103368 + ... + 114739.

It is an arithmetic number, because the mean of its divisors is an integer number (232612182).

Almost surely, 2^1240156402 is an apocalyptic number.

1240156402 is a deficient number, since it is larger than the sum of its proper divisors (620741054).

1240156402 is a wasteful number, since it uses less digits than its factorization.

1240156402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220952.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1240156402 is about 35215.8544124660. The cubic root of 1240156402 is about 1074.3822380327.

Adding to 1240156402 its reverse (2046510421), we get a palindrome (3286666823).

The spelling of 1240156402 in words is "one billion, two hundred forty million, one hundred fifty-six thousand, four hundred two".