99742391 has 12 divisors (see below), whose sum is σ = 117996840. Its totient is φ = 84042000.

The previous prime is 99742387. The next prime is 99742393. The reversal of 99742391 is 19324799.

It is not a de Polignac number, because 99742391 - 2² = 99742387 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 (99742393) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14360 + ... + 20141.

It is an arithmetic number, because the mean of its divisors is an integer number (9833070).

Almost surely, 2^99742391 is an apocalyptic number.

99742391 is a deficient number, since it is larger than the sum of its proper divisors (18254449).

99742391 is a wasteful number, since it uses less digits than its factorization.

99742391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34574 (or 34567 counting only the distinct ones).

The product of its digits is 122472, while the sum is 44.

The square root of 99742391 is about 9987.1112439984. Note that the first 3 decimals coincide. The cubic root of 99742391 is about 463.7599689325.

The spelling of 99742391 in words is "ninety-nine million, seven hundred forty-two thousand, three hundred ninety-one".