18961402 has 16 divisors (see below), whose sum is σ = 29287872. Its totient is φ = 9203040.

The previous prime is 18961381. The next prime is 18961403. The reversal of 18961402 is 20416981.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18961403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8518 + ... + 10510.

It is an arithmetic number, because the mean of its divisors is an integer number (1830492).

Almost surely, 2^18961402 is an apocalyptic number.

18961402 is a deficient number, since it is larger than the sum of its proper divisors (10326470).

18961402 is a wasteful number, since it uses less digits than its factorization.

18961402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 18961402 is about 4354.4691984213. The cubic root of 18961402 is about 266.6593494520.

The spelling of 18961402 in words is "eighteen million, nine hundred sixty-one thousand, four hundred two".