34721240 has 32 divisors (see below), whose sum is σ = 80645760. Its totient is φ = 13440000.

The previous prime is 34721233. The next prime is 34721243. The reversal of 34721240 is 4212743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (34721243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12761 + ... + 15240.

It is an arithmetic number, because the mean of its divisors is an integer number (2520180).

Almost surely, 2^34721240 is an apocalyptic number.

It is an amenable number.

34721240 is an abundant number, since it is smaller than the sum of its proper divisors (45924520).

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

34721240 is a wasteful number, since it uses less digits than its factorization.

34721240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28043 (or 28039 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 34721240 is about 5892.4731649792. The cubic root of 34721240 is about 326.2358938524.

Adding to 34721240 its reverse (4212743), we get a palindrome (38933983).

The spelling of 34721240 in words is "thirty-four million, seven hundred twenty-one thousand, two hundred forty".