31440147 has 16 divisors (see below), whose sum is σ = 43524000. Its totient is φ = 20163584.

The previous prime is 31440127. The next prime is 31440161. The reversal of 31440147 is 74104413.

It is not a de Polignac number, because 31440147 - 2⁶ = 31440083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31440127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33379 + ... + 34307.

It is an arithmetic number, because the mean of its divisors is an integer number (2720250).

Almost surely, 2^31440147 is an apocalyptic number.

31440147 is a deficient number, since it is larger than the sum of its proper divisors (12083853).

31440147 is a wasteful number, since it uses less digits than its factorization.

31440147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 31440147 is about 5607.1514158260. The cubic root of 31440147 is about 315.6178249782.

The spelling of 31440147 in words is "thirty-one million, four hundred forty thousand, one hundred forty-seven".