187149820 has 48 divisors (see below), whose sum is σ = 461730528. Its totient is φ = 62818560.

The previous prime is 187149799. The next prime is 187149863. The reversal of 187149820 is 28941781.

It is a happy number.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29859 + ... + 35578.

It is an arithmetic number, because the mean of its divisors is an integer number (9619386).

Almost surely, 2^187149820 is an apocalyptic number.

187149820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

187149820 is an abundant number, since it is smaller than the sum of its proper divisors (274580708).

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

187149820 is a wasteful number, since it uses less digits than its factorization.

187149820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65470 (or 65468 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 187149820 is about 13680.2711961423. The cubic root of 187149820 is about 572.0005827500. Note that the first 3 decimals are identical.

The spelling of 187149820 in words is "one hundred eighty-seven million, one hundred forty-nine thousand, eight hundred twenty".