99940487 has 4 divisors (see below), whose sum is σ = 100003176. Its totient is φ = 99877800.

The previous prime is 99940429. The next prime is 99940499. The reversal of 99940487 is 78404999.

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 99940487 - 2⁸ = 99940231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99942487) 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, 28889 + ... + 32162.

It is an arithmetic number, because the mean of its divisors is an integer number (25000794).

Almost surely, 2^99940487 is an apocalyptic number.

99940487 is a deficient number, since it is larger than the sum of its proper divisors (62689).

99940487 is a wasteful number, since it uses less digits than its factorization.

99940487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62688.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 99940487 is about 9997.0239071436. The cubic root of 99940487 is about 464.0667867970.

The spelling of 99940487 in words is "ninety-nine million, nine hundred forty thousand, four hundred eighty-seven".