74439945 has 16 divisors (see below), whose sum is σ = 132337920. Its totient is φ = 39701232.

The previous prime is 74439917. The next prime is 74439973. The reversal of 74439945 is 54993447.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (74439917) and next prime (74439973).

It is not a de Polignac number, because 74439945 - 2⁷ = 74439817 is a prime.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 74439945.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275569 + ... + 275838.

It is an arithmetic number, because the mean of its divisors is an integer number (8271120).

Almost surely, 2^74439945 is an apocalyptic number.

It is an amenable number.

74439945 is a deficient number, since it is larger than the sum of its proper divisors (57897975).

74439945 is a wasteful number, since it uses less digits than its factorization.

74439945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551421 (or 551415 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 74439945 is about 8627.8586567004. The cubic root of 74439945 is about 420.6640007126.

The spelling of 74439945 in words is "seventy-four million, four hundred thirty-nine thousand, nine hundred forty-five".