18401949 has 6 divisors (see below), whose sum is σ = 26580606. Its totient is φ = 12267960.

The previous prime is 18401927. The next prime is 18401953. The reversal of 18401949 is 94910481.

It can be written as a sum of positive squares in only one way, i.e., 18020025 + 381924 = 4245^2 + 618^2 .

It is not a de Polignac number, because 18401949 - 2⁷ = 18401821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18401969) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1022322 + ... + 1022339.

It is an arithmetic number, because the mean of its divisors is an integer number (4430101).

Almost surely, 2^18401949 is an apocalyptic number.

It is an amenable number.

18401949 is a deficient number, since it is larger than the sum of its proper divisors (8178657).

18401949 is a wasteful number, since it uses less digits than its factorization.

18401949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2044667 (or 2044664 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18401949 is about 4289.7492933737. The cubic root of 18401949 is about 264.0105453777.

The spelling of 18401949 in words is "eighteen million, four hundred one thousand, nine hundred forty-nine".