1378021652 has 24 divisors (see below), whose sum is σ = 2851080960. Its totient is φ = 570215520.

The previous prime is 1378021651. The next prime is 1378021699. The reversal of 1378021652 is 2561208731.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378021651) 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, 847724 + ... + 849347.

It is an arithmetic number, because the mean of its divisors is an integer number (118795040).

Almost surely, 2^1378021652 is an apocalyptic number.

It is an amenable number.

1378021652 is an abundant number, since it is smaller than the sum of its proper divisors (1473059308).

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

1378021652 is a wasteful number, since it uses less digits than its factorization.

1378021652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1697111 (or 1697109 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 1378021652 is about 37121.7140229273. The cubic root of 1378021652 is about 1112.8040061665.

The spelling of 1378021652 in words is "one billion, three hundred seventy-eight million, twenty-one thousand, six hundred fifty-two".