31477842 has 64 divisors (see below), whose sum is σ = 76982400. Its totient is φ = 9455040.

The previous prime is 31477841. The next prime is 31477871. The reversal of 31477842 is 24877413.

31477842 = T₃₄₃ + T₃₄₄ + ... + T₆₁₁.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31477797 and 31477806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31477841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 116884 + ... + 117152.

It is an arithmetic number, because the mean of its divisors is an integer number (1202850).

Almost surely, 2^31477842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31477842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38491200).

31477842 is an abundant number, since it is smaller than the sum of its proper divisors (45504558).

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

31477842 is a wasteful number, since it uses less digits than its factorization.

31477842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488 (or 482 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 31477842 is about 5610.5117413655. The cubic root of 31477842 is about 315.7439107158.

The spelling of 31477842 in words is "thirty-one million, four hundred seventy-seven thousand, eight hundred forty-two".