490921087 has 4 divisors (see below), whose sum is σ = 519798816. Its totient is φ = 462043360.

The previous prime is 490921061. The next prime is 490921091. The reversal of 490921087 is 780129094.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 490921087 - 2¹⁹ = 490396799 is a prime.

It is a super-2 number, since 2×490921087² = 482007027322523138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (490921007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14438839 + ... + 14438872.

It is an arithmetic number, because the mean of its divisors is an integer number (129949704).

Almost surely, 2^490921087 is an apocalyptic number.

490921087 is a deficient number, since it is larger than the sum of its proper divisors (28877729).

490921087 is a wasteful number, since it uses less digits than its factorization.

490921087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28877728.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 490921087 is about 22156.7390876907. The cubic root of 490921087 is about 788.8671939070.

The spelling of 490921087 in words is "four hundred ninety million, nine hundred twenty-one thousand, eighty-seven".