1372740721 has 16 divisors (see below), whose sum is σ = 1537704000. Its totient is φ = 1214617600.

The previous prime is 1372740697. The next prime is 1372740731. The reversal of 1372740721 is 1270472731.

It is a cyclic number.

It is not a de Polignac number, because 1372740721 - 2⁹ = 1372740209 is a prime.

It is a super-3 number, since 3×1372740721³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1372740731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199110 + ... + 205888.

It is an arithmetic number, because the mean of its divisors is an integer number (96106500).

Almost surely, 2^1372740721 is an apocalyptic number.

1372740721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1372740721 is a deficient number, since it is larger than the sum of its proper divisors (164963279).

1372740721 is a wasteful number, since it uses less digits than its factorization.

1372740721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7280.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 1372740721 is about 37050.5157993786. The cubic root of 1372740721 is about 1111.3806700097.

The spelling of 1372740721 in words is "one billion, three hundred seventy-two million, seven hundred forty thousand, seven hundred twenty-one".