191949490 has 32 divisors (see below), whose sum is σ = 364144896. Its totient is φ = 72705600.

The previous prime is 191949481. The next prime is 191949491. The reversal of 191949490 is 94949191.

It is a super-2 number, since 2×191949490² = 73689213422520200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 191949490.

It is not an unprimeable number, because it can be changed into a prime (191949491) 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, 19099 + ... + 27361.

It is an arithmetic number, because the mean of its divisors is an integer number (11379528).

Almost surely, 2^191949490 is an apocalyptic number.

191949490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

191949490 is a deficient number, since it is larger than the sum of its proper divisors (172195406).

191949490 is a wasteful number, since it uses less digits than its factorization.

191949490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8394.

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 191949490 is about 13854.5837180335. The cubic root of 191949490 is about 576.8492347793.

The spelling of 191949490 in words is "one hundred ninety-one million, nine hundred forty-nine thousand, four hundred ninety".