31054140 has 144 divisors (see below), whose sum is σ = 106037568. Its totient is φ = 7299072.

The previous prime is 31054109. The next prime is 31054141. The reversal of 31054140 is 4145013.

It is a happy number.

It is a super-2 number, since 2×31054140² = 1928719222279200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31054141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53532 + ... + 54108.

It is an arithmetic number, because the mean of its divisors is an integer number (736372).

Almost surely, 2^31054140 is an apocalyptic number.

31054140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31054140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53018784).

31054140 is an abundant number, since it is smaller than the sum of its proper divisors (74983428).

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

31054140 is a wasteful number, since it uses less digits than its factorization.

31054140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628 (or 623 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 31054140 is about 5572.6241574325. The cubic root of 31054140 is about 314.3208345247.

Adding to 31054140 its reverse (4145013), we get a palindrome (35199153).

The spelling of 31054140 in words is "thirty-one million, fifty-four thousand, one hundred forty".