1242155454 has 16 divisors (see below), whose sum is σ = 2485002240. Its totient is φ = 413936600.

The previous prime is 1242155449. The next prime is 1242155477. The reversal of 1242155454 is 4545512421.

It is a happy number.

It is a super-2 number, since 2×1242155454² = 3085900343803892232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3774 + ... + 49985.

It is an arithmetic number, because the mean of its divisors is an integer number (155312640).

Almost surely, 2^1242155454 is an apocalyptic number.

1242155454 is an abundant number, since it is smaller than the sum of its proper divisors (1242846786).

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

1242155454 is a wasteful number, since it uses less digits than its factorization.

1242155454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57615.

The product of its digits is 32000, while the sum is 33.

The square root of 1242155454 is about 35244.2258249490. The cubic root of 1242155454 is about 1074.9592063842.

Adding to 1242155454 its reverse (4545512421), we get a palindrome (5787667875).

The spelling of 1242155454 in words is "one billion, two hundred forty-two million, one hundred fifty-five thousand, four hundred fifty-four".