187149440 has 64 divisors (see below), whose sum is σ = 450040320. Its totient is φ = 74419200.

The previous prime is 187149439. The next prime is 187149491. The reversal of 187149440 is 44941781.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 187149394 and 187149403.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121475 + ... + 123005.

It is an arithmetic number, because the mean of its divisors is an integer number (7031880).

Almost surely, 2^187149440 is an apocalyptic number.

187149440 is a gapful number since it is divisible by the number (10) 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 187149440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225020160).

187149440 is an abundant number, since it is smaller than the sum of its proper divisors (262890880).

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

187149440 is a wasteful number, since it uses less digits than its factorization.

187149440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1741 (or 1729 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 187149440 is about 13680.2573075217. The cubic root of 187149440 is about 572.0001956085. Note that the first 3 decimals are identical.

The spelling of 187149440 in words is "one hundred eighty-seven million, one hundred forty-nine thousand, four hundred forty".