1243990854 has 12 divisors (see below), whose sum is σ = 2695313556. Its totient is φ = 414663612.

The previous prime is 1243990829. The next prime is 1243990859. The reversal of 1243990854 is 4580993421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243990859) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34555284 + ... + 34555319.

It is an arithmetic number, because the mean of its divisors is an integer number (224609463).

Almost surely, 2^1243990854 is an apocalyptic number.

1243990854 is an abundant number, since it is smaller than the sum of its proper divisors (1451322702).

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

1243990854 is a wasteful number, since it uses less digits than its factorization.

1243990854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69110611 (or 69110608 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 1243990854 is about 35270.2545213385. The cubic root of 1243990854 is about 1075.4883965013.

The spelling of 1243990854 in words is "one billion, two hundred forty-three million, nine hundred ninety thousand, eight hundred fifty-four".