30400236 has 72 divisors (see below), whose sum is σ = 81747120. Its totient is φ = 9507456.

The previous prime is 30400231. The next prime is 30400241. The reversal of 30400236 is 63200403.

30400236 is a `hidden beast` number, since 30 + 400 + 236 = 666.

It is an interprime number because it is at equal distance from previous prime (30400231) and next prime (30400241).

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

It is not an unprimeable number, because it can be changed into a prime (30400231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38235 + ... + 39021.

Almost surely, 2^30400236 is an apocalyptic number.

30400236 is a gapful number since it is divisible by the number (36) 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 30400236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40873560).

30400236 is an abundant number, since it is smaller than the sum of its proper divisors (51346884).

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

30400236 is a wasteful number, since it uses less digits than its factorization.

30400236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863 (or 858 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 30400236 is about 5513.6409023439. The cubic root of 30400236 is about 312.0989577619.

Adding to 30400236 its reverse (63200403), we get a palindrome (93600639).

The spelling of 30400236 in words is "thirty million, four hundred thousand, two hundred thirty-six".