30402661 has 4 divisors (see below), whose sum is σ = 31383424. Its totient is φ = 29421900.

The previous prime is 30402653. The next prime is 30402683. The reversal of 30402661 is 16620403.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16620403 = 43 ⋅386521.

It is a cyclic number.

It is not a de Polignac number, because 30402661 - 2³ = 30402653 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 (30402601) 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, 490335 + ... + 490396.

It is an arithmetic number, because the mean of its divisors is an integer number (7845856).

Almost surely, 2^30402661 is an apocalyptic number.

30402661 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

30402661 is a deficient number, since it is larger than the sum of its proper divisors (980763).

30402661 is an equidigital number, since it uses as much as digits as its factorization.

30402661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980762.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 30402661 is about 5513.8608070933. The cubic root of 30402661 is about 312.1072561607.

The spelling of 30402661 in words is "thirty million, four hundred two thousand, six hundred sixty-one".