901720987 has 8 divisors (see below), whose sum is σ = 955562400. Its totient is φ = 847968384.

The previous prime is 901720961. The next prime is 901720999. The reversal of 901720987 is 789027109.

It is a happy number.

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 901720987 - 2²³ = 893332379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (901720927) 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, 687 + ... + 42472.

It is an arithmetic number, because the mean of its divisors is an integer number (119445300).

Almost surely, 2^901720987 is an apocalyptic number.

901720987 is a deficient number, since it is larger than the sum of its proper divisors (53841413).

901720987 is a wasteful number, since it uses less digits than its factorization.

901720987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44405.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 901720987 is about 30028.6694177414. The cubic root of 901720987 is about 966.1043981977.

The spelling of 901720987 in words is "nine hundred one million, seven hundred twenty thousand, nine hundred eighty-seven".