1397378722 has 8 divisors (see below), whose sum is σ = 2103475536. Its totient is φ = 696220212.

The previous prime is 1397378711. The next prime is 1397378743. The reversal of 1397378722 is 2278737931.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1233868 + ... + 1234999.

It is an arithmetic number, because the mean of its divisors is an integer number (262934442).

Almost surely, 2^1397378722 is an apocalyptic number.

1397378722 is a deficient number, since it is larger than the sum of its proper divisors (706096814).

1397378722 is a wasteful number, since it uses less digits than its factorization.

1397378722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2469152.

The product of its digits is 889056, while the sum is 49.

The square root of 1397378722 is about 37381.5291554532. The cubic root of 1397378722 is about 1117.9903166607.

The spelling of 1397378722 in words is "one billion, three hundred ninety-seven million, three hundred seventy-eight thousand, seven hundred twenty-two".