245439990 has 32 divisors (see below), whose sum is σ = 654507360. Its totient is φ = 65450592.

The previous prime is 245439977. The next prime is 245439991. The reversal of 245439990 is 99934542.

It is a happy number.

245439990 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245439991) 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, 454249 + ... + 454788.

It is an arithmetic number, because the mean of its divisors is an integer number (20453355).

Almost surely, 2^245439990 is an apocalyptic number.

245439990 is an abundant number, since it is smaller than the sum of its proper divisors (409067370).

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

245439990 is a wasteful number, since it uses less digits than its factorization.

245439990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909053 (or 909047 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 245439990 is about 15666.5245029011. The cubic root of 245439990 is about 626.1068301927.

The spelling of 245439990 in words is "two hundred forty-five million, four hundred thirty-nine thousand, nine hundred ninety".