30406840 has 32 divisors (see below), whose sum is σ = 72018000. Its totient is φ = 11522304.

The previous prime is 30406807. The next prime is 30406841. The reversal of 30406840 is 4860403.

30406840 is a modest number, since divided by 6840 gives 3040 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30406841) 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, 19245 + ... + 20764.

Almost surely, 2^30406840 is an apocalyptic number.

It is an amenable number.

30406840 is an abundant number, since it is smaller than the sum of its proper divisors (41611160).

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

30406840 is a wasteful number, since it uses less digits than its factorization.

30406840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40039 (or 40035 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 30406840 is about 5514.2397481430. The cubic root of 30406840 is about 312.1215557475.

It can be divided in two parts, 3040 and 6840, that multiplied together give a square (20793600 = 4560²).

The spelling of 30406840 in words is "thirty million, four hundred six thousand, eight hundred forty".