45378921 has 16 divisors (see below), whose sum is σ = 69657984. Its totient is φ = 25739904.

The previous prime is 45378919. The next prime is 45378941. The reversal of 45378921 is 12987354.

It is not a de Polignac number, because 45378921 - 2¹ = 45378919 is a prime.

It is a super-2 number, since 2×45378921² = 4118492942248482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 45378921.

It is not an unprimeable number, because it can be changed into a prime (45378901) 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, 5010 + ... + 10763.

It is an arithmetic number, because the mean of its divisors is an integer number (4353624).

Almost surely, 2^45378921 is an apocalyptic number.

It is an amenable number.

45378921 is a deficient number, since it is larger than the sum of its proper divisors (24279063).

45378921 is a wasteful number, since it uses less digits than its factorization.

45378921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15920.

The product of its digits is 60480, while the sum is 39.

The square root of 45378921 is about 6736.3878302841. The cubic root of 45378921 is about 356.6848979918.

It can be divided in two parts, 453789 and 21, that multiplied together give a square (9529569 = 3087²).

The spelling of 45378921 in words is "forty-five million, three hundred seventy-eight thousand, nine hundred twenty-one".