1252629278 has 4 divisors (see below), whose sum is σ = 1878943920. Its totient is φ = 626314638.

The previous prime is 1252629271. The next prime is 1252629281. The reversal of 1252629278 is 8729262521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8729262521 = 7 ⋅1247037503.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252629271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313157318 + ... + 313157321.

It is an arithmetic number, because the mean of its divisors is an integer number (469735980).

Almost surely, 2^1252629278 is an apocalyptic number.

1252629278 is a deficient number, since it is larger than the sum of its proper divisors (626314642).

1252629278 is an equidigital number, since it uses as much as digits as its factorization.

1252629278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626314641.

The product of its digits is 241920, while the sum is 44.

The square root of 1252629278 is about 35392.5031327257. The cubic root of 1252629278 is about 1077.9720971066.

The spelling of 1252629278 in words is "one billion, two hundred fifty-two million, six hundred twenty-nine thousand, two hundred seventy-eight".