1929397140 has 72 divisors (see below), whose sum is σ = 6384557088. Its totient is φ = 467732160.

The previous prime is 1929397117. The next prime is 1929397163. The reversal of 1929397140 is 417939291.

It is an interprime number because it is at equal distance from previous prime (1929397117) and next prime (1929397163).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 485242 + ... + 489201.

It is an arithmetic number, because the mean of its divisors is an integer number (88674404).

Almost surely, 2^1929397140 is an apocalyptic number.

1929397140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1929397140 is an abundant number, since it is smaller than the sum of its proper divisors (4455159948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1929397140 is a wasteful number, since it uses less digits than its factorization.

1929397140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974469 (or 974464 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 1929397140 is about 43924.9034148056. The cubic root of 1929397140 is about 1244.9174184350.

The spelling of 1929397140 in words is "one billion, nine hundred twenty-nine million, three hundred ninety-seven thousand, one hundred forty".