1881787 has 2 divisors, whose sum is σ = 1881788. Its totient is φ = 1881786.

The previous prime is 1881769. The next prime is 1881799. The reversal of 1881787 is 7871881.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1881787 is a prime.

It is a super-2 number, since 2×1881787² = 7082244626738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1881757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940893 + 940894.

It is an arithmetic number, because the mean of its divisors is an integer number (940894).

2^1881787 is an apocalyptic number.

1881787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881787 is an equidigital number, since it uses as much as digits as its factorization.

1881787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25088, while the sum is 40.

The square root of 1881787 is about 1371.7824171493. The cubic root of 1881787 is about 123.4592083916.

The spelling of 1881787 in words is "one million, eight hundred eighty-one thousand, seven hundred eighty-seven".