861987307 has 8 divisors (see below), whose sum is σ = 946805760. Its totient is φ = 781113960.

The previous prime is 861987293. The next prime is 861987317. The reversal of 861987307 is 703789168.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 861987307 - 2¹⁵ = 861954539 is a prime.

It is a super-2 number, since 2×861987307² = 1486044234858224498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861987317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 985819 + ... + 986692.

It is an arithmetic number, because the mean of its divisors is an integer number (118350720).

Almost surely, 2^861987307 is an apocalyptic number.

861987307 is a deficient number, since it is larger than the sum of its proper divisors (84818453).

861987307 is a wasteful number, since it uses less digits than its factorization.

861987307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1972553.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 861987307 is about 29359.6203483628. The cubic root of 861987307 is about 951.7004841701.

The spelling of 861987307 in words is "eight hundred sixty-one million, nine hundred eighty-seven thousand, three hundred seven".