1554440242 has 4 divisors (see below), whose sum is σ = 2331660366. Its totient is φ = 777220120.

The previous prime is 1554440231. The next prime is 1554440243. The reversal of 1554440242 is 2420444551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1387488001 + 166952241 = 37249^2 + 12921^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1554440243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 388610059 + ... + 388610062.

Almost surely, 2^1554440242 is an apocalyptic number.

1554440242 is a deficient number, since it is larger than the sum of its proper divisors (777220124).

1554440242 is an equidigital number, since it uses as much as digits as its factorization.

1554440242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777220123.

The product of its (nonzero) digits is 25600, while the sum is 31.

The square root of 1554440242 is about 39426.3901720662. The cubic root of 1554440242 is about 1158.3985635413.

Adding to 1554440242 its reverse (2420444551), we get a palindrome (3974884793).

The spelling of 1554440242 in words is "one billion, five hundred fifty-four million, four hundred forty thousand, two hundred forty-two".