1921907386 has 32 divisors (see below), whose sum is σ = 3337759872. Its totient is φ = 812961600.

The previous prime is 1921907371. The next prime is 1921907387. The reversal of 1921907386 is 6837091291.

It is a happy number.

It is a super-2 number, since 2×1921907386² = 7387456000722705992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1921907387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 488700 + ... + 492616.

It is an arithmetic number, because the mean of its divisors is an integer number (104304996).

Almost surely, 2^1921907386 is an apocalyptic number.

1921907386 is a deficient number, since it is larger than the sum of its proper divisors (1415852486).

1921907386 is a wasteful number, since it uses less digits than its factorization.

1921907386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4374.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 1921907386 is about 43839.5641629795. The cubic root of 1921907386 is about 1243.3044419842.

The spelling of 1921907386 in words is "one billion, nine hundred twenty-one million, nine hundred seven thousand, three hundred eighty-six".