403893945 has 144 divisors (see below), whose sum is σ = 901660032. Its totient is φ = 169827840.

The previous prime is 403893943. The next prime is 403893949. The reversal of 403893945 is 549398304.

It is a happy number.

It is not a de Polignac number, because 403893945 - 2¹ = 403893943 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 403893945.

It is not an unprimeable number, because it can be changed into a prime (403893943) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1437205 + ... + 1437485.

It is an arithmetic number, because the mean of its divisors is an integer number (6261528).

Almost surely, 2^403893945 is an apocalyptic number.

403893945 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

403893945 is an abundant number, since it is smaller than the sum of its proper divisors (497766087).

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

403893945 is a wasteful number, since it uses less digits than its factorization.

403893945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The square root of 403893945 is about 20097.1128523477. The cubic root of 403893945 is about 739.1894857197.

The spelling of 403893945 in words is "four hundred three million, eight hundred ninety-three thousand, nine hundred forty-five".