1392276721 has 8 divisors (see below), whose sum is σ = 1519313184. Its totient is φ = 1265317920.

The previous prime is 1392276713. The next prime is 1392276757. The reversal of 1392276721 is 1276722931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1392276721 - 2³ = 1392276713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1392276121) 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, 21910 + ... + 57136.

It is an arithmetic number, because the mean of its divisors is an integer number (189914148).

Almost surely, 2^1392276721 is an apocalyptic number.

1392276721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1392276721 is a deficient number, since it is larger than the sum of its proper divisors (127036463).

1392276721 is a wasteful number, since it uses less digits than its factorization.

1392276721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38831.

The product of its digits is 63504, while the sum is 40.

The square root of 1392276721 is about 37313.2244787287. The cubic root of 1392276721 is about 1116.6280174440.

The spelling of 1392276721 in words is "one billion, three hundred ninety-two million, two hundred seventy-six thousand, seven hundred twenty-one".