1380397951 has 2 divisors, whose sum is σ = 1380397952. Its totient is φ = 1380397950.

The previous prime is 1380397939. The next prime is 1380397957. The reversal of 1380397951 is 1597930831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1380397951 - 2⁵ = 1380397919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1380397957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690198975 + 690198976.

It is an arithmetic number, because the mean of its divisors is an integer number (690198976).

Almost surely, 2^1380397951 is an apocalyptic number.

1380397951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1380397951 is an equidigital number, since it uses as much as digits as its factorization.

1380397951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 46.

The square root of 1380397951 is about 37153.7070963316. The cubic root of 1380397951 is about 1113.4432889378.

The spelling of 1380397951 in words is "one billion, three hundred eighty million, three hundred ninety-seven thousand, nine hundred fifty-one".