196990155 has 12 divisors (see below), whose sum is σ = 341449680. Its totient is φ = 105061392.

The previous prime is 196990153. The next prime is 196990163. The reversal of 196990155 is 551099691.

It is a happy number.

It is not a de Polignac number, because 196990155 - 2¹ = 196990153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 4377559 = 196990155 / (1 + 9 + 6 + 9 + 9 + 0 + 1 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 196990155.

It is not an unprimeable number, because it can be changed into a prime (196990153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2188735 + ... + 2188824.

It is an arithmetic number, because the mean of its divisors is an integer number (28454140).

Almost surely, 2^196990155 is an apocalyptic number.

196990155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

196990155 is a deficient number, since it is larger than the sum of its proper divisors (144459525).

196990155 is a wasteful number, since it uses less digits than its factorization.

196990155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4377570 (or 4377567 counting only the distinct ones).

The product of its (nonzero) digits is 109350, while the sum is 45.

The square root of 196990155 is about 14035.3181296328. The cubic root of 196990155 is about 581.8550937645.

The spelling of 196990155 in words is "one hundred ninety-six million, nine hundred ninety thousand, one hundred fifty-five".