1453978388 has 6 divisors (see below), whose sum is σ = 2544462186. Its totient is φ = 726989192.

The previous prime is 1453978387. The next prime is 1453978391. The reversal of 1453978388 is 8838793541.

It can be written as a sum of positive squares in only one way, i.e., 1430957584 + 23020804 = 37828^2 + 4798^2 .

It is a super-2 number, since 2×1453978388² = 4228106305542157088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1453978387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 181747295 + ... + 181747302.

It is an arithmetic number, because the mean of its divisors is an integer number (424077031).

Almost surely, 2^1453978388 is an apocalyptic number.

It is an amenable number.

1453978388 is a deficient number, since it is larger than the sum of its proper divisors (1090483798).

1453978388 is a wasteful number, since it uses less digits than its factorization.

1453978388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363494601 (or 363494599 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 56.

The square root of 1453978388 is about 38131.0685399714. The cubic root of 1453978388 is about 1132.8854100356.

The spelling of 1453978388 in words is "one billion, four hundred fifty-three million, nine hundred seventy-eight thousand, three hundred eighty-eight".