18992401 has 2 divisors, whose sum is σ = 18992402. Its totient is φ = 18992400.

The previous prime is 18992377. The next prime is 18992431. The reversal of 18992401 is 10429981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11424400 + 7568001 = 3380^2 + 2751^2 .

It is a cyclic number.

It is not a de Polignac number, because 18992401 - 2¹¹ = 18990353 is a prime.

It is a super-2 number, since 2×18992401² = 721422591489602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18992431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9496200 + 9496201.

It is an arithmetic number, because the mean of its divisors is an integer number (9496201).

Almost surely, 2^18992401 is an apocalyptic number.

It is an amenable number.

18992401 is a deficient number, since it is larger than the sum of its proper divisors (1).

18992401 is an equidigital number, since it uses as much as digits as its factorization.

18992401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 18992401 is about 4358.0271912874. The cubic root of 18992401 is about 266.8045861213.

The spelling of 18992401 in words is "eighteen million, nine hundred ninety-two thousand, four hundred one".