1920939401 has 4 divisors (see below), whose sum is σ = 1921034112. Its totient is φ = 1920844692.

The previous prime is 1920939359. The next prime is 1920939409. The reversal of 1920939401 is 1049390291.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1920939401 - 2⁶ = 1920939337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1920939409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3221 + ... + 62066.

It is an arithmetic number, because the mean of its divisors is an integer number (480258528).

Almost surely, 2^1920939401 is an apocalyptic number.

It is an amenable number.

1920939401 is a deficient number, since it is larger than the sum of its proper divisors (94711).

1920939401 is an equidigital number, since it uses as much as digits as its factorization.

1920939401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94710.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 1920939401 is about 43828.5226878570. The cubic root of 1920939401 is about 1243.0956733122.

The spelling of 1920939401 in words is "one billion, nine hundred twenty million, nine hundred thirty-nine thousand, four hundred one".