99989390 has 16 divisors (see below), whose sum is σ = 186187680. Its totient is φ = 38616480.

The previous prime is 99989389. The next prime is 99989423. The reversal of 99989390 is 9398999.

It is a happy number.

It is a super-2 number, since 2×99989390² = 19995756225144200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172106 + ... + 172685.

It is an arithmetic number, because the mean of its divisors is an integer number (11636730).

Almost surely, 2^99989390 is an apocalyptic number.

99989390 is a deficient number, since it is larger than the sum of its proper divisors (86198290).

99989390 is a wasteful number, since it uses less digits than its factorization.

99989390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344827.

The product of its (nonzero) digits is 1417176, while the sum is 56.

The square root of 99989390 is about 9999.4694859277. The cubic root of 99989390 is about 464.1424670282.

The spelling of 99989390 in words is "ninety-nine million, nine hundred eighty-nine thousand, three hundred ninety".