180309400 has 24 divisors (see below), whose sum is σ = 419219820. Its totient is φ = 72123680.

The previous prime is 180309391. The next prime is 180309407. The reversal of 180309400 is 4903081.

It is a super-2 number, since 2×180309400² = 65022959456720000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180309407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 450574 + ... + 450973.

Almost surely, 2^180309400 is an apocalyptic number.

180309400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

180309400 is an abundant number, since it is smaller than the sum of its proper divisors (238910420).

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

180309400 is a wasteful number, since it uses less digits than its factorization.

180309400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901563 (or 901554 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 180309400 is about 13427.9335714770. The cubic root of 180309400 is about 564.9449394226.

The spelling of 180309400 in words is "one hundred eighty million, three hundred nine thousand, four hundred".