45390321 has 32 divisors (see below), whose sum is σ = 69632640. Its totient is φ = 29203200.

The previous prime is 45390299. The next prime is 45390337. The reversal of 45390321 is 12309354.

It is not a de Polignac number, because 45390321 - 2¹⁵ = 45357553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (45390341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 144861 + ... + 145173.

It is an arithmetic number, because the mean of its divisors is an integer number (2176020).

Almost surely, 2^45390321 is an apocalyptic number.

45390321 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

45390321 is a deficient number, since it is larger than the sum of its proper divisors (24242319).

45390321 is a wasteful number, since it uses less digits than its factorization.

45390321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494 (or 488 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 45390321 is about 6737.2339279559. The cubic root of 45390321 is about 356.7147640419.

Adding to 45390321 its reverse (12309354), we get a palindrome (57699675).

The spelling of 45390321 in words is "forty-five million, three hundred ninety thousand, three hundred twenty-one".