1378519964 has 24 divisors (see below), whose sum is σ = 2476185600. Its totient is φ = 671186736.

The previous prime is 1378519963. The next prime is 1378519969. The reversal of 1378519964 is 4699158731.

It is a super-4 number, since 4×1378519964⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378519963) 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, 18989 + ... + 55835.

It is an arithmetic number, because the mean of its divisors is an integer number (103174400).

Almost surely, 2^1378519964 is an apocalyptic number.

It is an amenable number.

1378519964 is a deficient number, since it is larger than the sum of its proper divisors (1097665636).

1378519964 is a wasteful number, since it uses less digits than its factorization.

1378519964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37097 (or 37095 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 53.

The square root of 1378519964 is about 37128.4252830631. The cubic root of 1378519964 is about 1112.9381251917.

The spelling of 1378519964 in words is "one billion, three hundred seventy-eight million, five hundred nineteen thousand, nine hundred sixty-four".