31006406 has 8 divisors (see below), whose sum is σ = 46659144. Its totient is φ = 15453360.

The previous prime is 31006403. The next prime is 31006411. The reversal of 31006406 is 60460013.

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

It is a super-2 number, since 2×31006406² = 1922794426073672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31006403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24140 + ... + 25391.

It is an arithmetic number, because the mean of its divisors is an integer number (5832393).

Almost surely, 2^31006406 is an apocalyptic number.

31006406 is a deficient number, since it is larger than the sum of its proper divisors (15652738).

31006406 is a wasteful number, since it uses less digits than its factorization.

31006406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49846.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 31006406 is about 5568.3396088960. The cubic root of 31006406 is about 314.1597021192.

Adding to 31006406 its reverse (60460013), we get a palindrome (91466419).

The spelling of 31006406 in words is "thirty-one million, six thousand, four hundred six".