1951940409 has 32 divisors (see below), whose sum is σ = 2748641280. Its totient is φ = 1230792192.

The previous prime is 1951940407. The next prime is 1951940429. The reversal of 1951940409 is 9040491591.

1951940409 = 3075² + 3076² + ... + 3268².

It is a happy number.

It is not a de Polignac number, because 1951940409 - 2¹ = 1951940407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1951940401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 586452 + ... + 589770.

It is an arithmetic number, because the mean of its divisors is an integer number (85895040).

Almost surely, 2^1951940409 is an apocalyptic number.

It is an amenable number.

1951940409 is a deficient number, since it is larger than the sum of its proper divisors (796700871).

1951940409 is a wasteful number, since it uses less digits than its factorization.

1951940409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3509.

The product of its (nonzero) digits is 58320, while the sum is 42.

The square root of 1951940409 is about 44180.7696741467. The cubic root of 1951940409 is about 1249.7472361451.

The spelling of 1951940409 in words is "one billion, nine hundred fifty-one million, nine hundred forty thousand, four hundred nine".