199697477 has 16 divisors (see below), whose sum is σ = 242196480. Its totient is φ = 160944432.

The previous prime is 199697471. The next prime is 199697479. The reversal of 199697477 is 774796991.

199697477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 199697477 - 2¹⁶ = 199631941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199697471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1013 + ... + 20010.

It is an arithmetic number, because the mean of its divisors is an integer number (15137280).

Almost surely, 2^199697477 is an apocalyptic number.

It is an amenable number.

199697477 is a deficient number, since it is larger than the sum of its proper divisors (42499003).

199697477 is a wasteful number, since it uses less digits than its factorization.

199697477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21112.

The product of its digits is 6001128, while the sum is 59.

The square root of 199697477 is about 14131.4357727727. The cubic root of 199697477 is about 584.5085379744.

The spelling of 199697477 in words is "one hundred ninety-nine million, six hundred ninety-seven thousand, four hundred seventy-seven".