71438940 has 36 divisors (see below), whose sum is σ = 216698664. Its totient is φ = 19050336.

The previous prime is 71438929. The next prime is 71438957. The reversal of 71438940 is 4983417.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 71438895 and 71438904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 198262 + ... + 198621.

Almost surely, 2^71438940 is an apocalyptic number.

It is an amenable number.

71438940 is an abundant number, since it is smaller than the sum of its proper divisors (145259724).

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

71438940 is a wasteful number, since it uses less digits than its factorization.

71438940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396898 (or 396893 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 71438940 is about 8452.1559379841. The cubic root of 71438940 is about 414.9333419817.

The spelling of 71438940 in words is "seventy-one million, four hundred thirty-eight thousand, nine hundred forty".