623498909 has 4 divisors (see below), whose sum is σ = 680180640. Its totient is φ = 566817180.

The previous prime is 623498903. The next prime is 623498917. The reversal of 623498909 is 909894326.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 623498909 - 2¹² = 623494813 is a prime.

It is a super-3 number, since 3×623498909³ (a number of 27 digits) contains 333 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 (623498903) 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, 28340849 + ... + 28340870.

It is an arithmetic number, because the mean of its divisors is an integer number (170045160).

Almost surely, 2^623498909 is an apocalyptic number.

It is an amenable number.

623498909 is a deficient number, since it is larger than the sum of its proper divisors (56681731).

623498909 is a wasteful number, since it uses less digits than its factorization.

623498909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56681730.

The product of its (nonzero) digits is 839808, while the sum is 50.

The square root of 623498909 is about 24969.9601321268. The cubic root of 623498909 is about 854.3029367497.

The spelling of 623498909 in words is "six hundred twenty-three million, four hundred ninety-eight thousand, nine hundred nine".