187420640 has 96 divisors (see below), whose sum is σ = 489234816. Its totient is φ = 67279360.

The previous prime is 187420633. The next prime is 187420669. The reversal of 187420640 is 46024781.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 187420597 and 187420606.

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, 145439 + ... + 146721.

It is an arithmetic number, because the mean of its divisors is an integer number (5096196).

Almost surely, 2^187420640 is an apocalyptic number.

187420640 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 187420640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244617408).

187420640 is an abundant number, since it is smaller than the sum of its proper divisors (301814176).

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

187420640 is a wasteful number, since it uses less digits than its factorization.

187420640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392 (or 1384 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 187420640 is about 13690.1658134589. The cubic root of 187420640 is about 572.2763591948.

The spelling of 187420640 in words is "one hundred eighty-seven million, four hundred twenty thousand, six hundred forty".