187981429 has 2 divisors, whose sum is σ = 187981430. Its totient is φ = 187981428.

The previous prime is 187981411. The next prime is 187981481. The reversal of 187981429 is 924189781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165636900 + 22344529 = 12870^2 + 4727^2 .

It is a cyclic number.

It is not a de Polignac number, because 187981429 - 2¹³ = 187973237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187981499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93990714 + 93990715.

It is an arithmetic number, because the mean of its divisors is an integer number (93990715).

Almost surely, 2^187981429 is an apocalyptic number.

It is an amenable number.

187981429 is a deficient number, since it is larger than the sum of its proper divisors (1).

187981429 is an equidigital number, since it uses as much as digits as its factorization.

187981429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 49.

The square root of 187981429 is about 13710.6319693878. The cubic root of 187981429 is about 572.8465680623.

The spelling of 187981429 in words is "one hundred eighty-seven million, nine hundred eighty-one thousand, four hundred twenty-nine".