1019778397 has 8 divisors (see below), whose sum is σ = 1112729760. Its totient is φ = 926867760.

The previous prime is 1019778379. The next prime is 1019778401. The reversal of 1019778397 is 7938779101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1019778397 - 2¹¹ = 1019776349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1019778307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68979 + ... + 82447.

It is an arithmetic number, because the mean of its divisors is an integer number (139091220).

Almost surely, 2^1019778397 is an apocalyptic number.

It is an amenable number.

1019778397 is a deficient number, since it is larger than the sum of its proper divisors (92951363).

1019778397 is a wasteful number, since it uses less digits than its factorization.

1019778397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20363.

The product of its (nonzero) digits is 666792, while the sum is 52.

The square root of 1019778397 is about 31933.9693273480. The cubic root of 1019778397 is about 1006.5498053873.

The spelling of 1019778397 in words is "one billion, nineteen million, seven hundred seventy-eight thousand, three hundred ninety-seven".