1376653421 has 24 divisors (see below), whose sum is σ = 1725470712. Its totient is φ = 1087257600.

The previous prime is 1376653393. The next prime is 1376653483. The reversal of 1376653421 is 1243566731.

It can be written as a sum of positive squares in 4 ways, for example, as 54967396 + 1321686025 = 7414^2 + 36355^2 .

It is not a de Polignac number, because 1376653421 - 2⁶ = 1376653357 is a prime.

It is a super-5 number, since 5×1376653421⁵ (a number of 47 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1376653121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1001 + ... + 52481.

It is an arithmetic number, because the mean of its divisors is an integer number (71894613).

Almost surely, 2^1376653421 is an apocalyptic number.

1376653421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1376653421 is a deficient number, since it is larger than the sum of its proper divisors (348817291).

1376653421 is a wasteful number, since it uses less digits than its factorization.

1376653421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51533 (or 51522 counting only the distinct ones).

The product of its digits is 90720, while the sum is 38.

The square root of 1376653421 is about 37103.2804614363. The cubic root of 1376653421 is about 1112.4355849755.

The spelling of 1376653421 in words is "one billion, three hundred seventy-six million, six hundred fifty-three thousand, four hundred twenty-one".