31442487 has 8 divisors (see below), whose sum is σ = 42497904. Its totient is φ = 20674368.

The previous prime is 31442479. The next prime is 31442491. The reversal of 31442487 is 78424413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31442487 - 2³ = 31442479 is a prime.

It is a super-4 number, since 4×31442487⁴ (a number of 31 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31442087) 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 7 ways as a sum of consecutive naturals, for example, 71568 + ... + 72005.

It is an arithmetic number, because the mean of its divisors is an integer number (5312238).

Almost surely, 2^31442487 is an apocalyptic number.

31442487 is a deficient number, since it is larger than the sum of its proper divisors (11055417).

31442487 is a wasteful number, since it uses less digits than its factorization.

31442487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143649.

The product of its digits is 21504, while the sum is 33.

The square root of 31442487 is about 5607.3600740455. The cubic root of 31442487 is about 315.6256549606.

The spelling of 31442487 in words is "thirty-one million, four hundred forty-two thousand, four hundred eighty-seven".