618739749 has 16 divisors (see below), whose sum is σ = 924768000. Its totient is φ = 408840768.

The previous prime is 618739739. The next prime is 618739811. The reversal of 618739749 is 947937816.

It is a happy number.

It is not a de Polignac number, because 618739749 - 2¹⁶ = 618674213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 618739695 and 618739704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618739729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98349 + ... + 104450.

It is an arithmetic number, because the mean of its divisors is an integer number (57798000).

Almost surely, 2^618739749 is an apocalyptic number.

It is an amenable number.

618739749 is a deficient number, since it is larger than the sum of its proper divisors (306028251).

618739749 is a wasteful number, since it uses less digits than its factorization.

618739749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202921 (or 202915 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 618739749 is about 24874.4798739592. The cubic root of 618739749 is about 852.1237545885.

The spelling of 618739749 in words is "six hundred eighteen million, seven hundred thirty-nine thousand, seven hundred forty-nine".