1920497739 has 16 divisors (see below), whose sum is σ = 2599610112. Its totient is φ = 1260998048.

The previous prime is 1920497717. The next prime is 1920497743. The reversal of 1920497739 is 9377940291.

1920497739 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1920497739 - 2¹³ = 1920489547 is a prime.

It is a super-2 number, since 2×1920497739² = 7376623131008224242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1920497691 and 1920497700.

It is not an unprimeable number, because it can be changed into a prime (1920497039) 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, 38242 + ... + 72824.

It is an arithmetic number, because the mean of its divisors is an integer number (162475632).

Almost surely, 2^1920497739 is an apocalyptic number.

1920497739 is a deficient number, since it is larger than the sum of its proper divisors (679112373).

1920497739 is a wasteful number, since it uses less digits than its factorization.

1920497739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34866.

The product of its (nonzero) digits is 857304, while the sum is 51.

The square root of 1920497739 is about 43823.4838756574. The cubic root of 1920497739 is about 1243.0003952408. Note that the first 3 decimals are identical.

The spelling of 1920497739 in words is "one billion, nine hundred twenty million, four hundred ninety-seven thousand, seven hundred thirty-nine".