501390945 has 64 divisors (see below), whose sum is σ = 1029646080. Its totient is φ = 228787200.

The previous prime is 501390941. The next prime is 501390997. The reversal of 501390945 is 549093105.

It is not a de Polignac number, because 501390945 - 2² = 501390941 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (501390941) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15315 + ... + 35175.

It is an arithmetic number, because the mean of its divisors is an integer number (16088220).

Almost surely, 2^501390945 is an apocalyptic number.

501390945 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

501390945 is an abundant number, since it is smaller than the sum of its proper divisors (528255135).

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

501390945 is a wasteful number, since it uses less digits than its factorization.

501390945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19903 (or 19897 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 501390945 is about 22391.7606498462. The cubic root of 501390945 is about 794.4358404025.

The spelling of 501390945 in words is "five hundred one million, three hundred ninety thousand, nine hundred forty-five".