1398027961 has 32 divisors (see below), whose sum is σ = 1639572480. Its totient is φ = 1178712000.

The previous prime is 1398027949. The next prime is 1398027971. The reversal of 1398027961 is 1697208931.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1398027961 - 2¹⁹ = 1397503673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1398027941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2173906 + ... + 2174548.

It is an arithmetic number, because the mean of its divisors is an integer number (51236640).

Almost surely, 2^1398027961 is an apocalyptic number.

1398027961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1398027961 is a deficient number, since it is larger than the sum of its proper divisors (241544519).

1398027961 is a wasteful number, since it uses less digits than its factorization.

1398027961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 1398027961 is about 37390.2121015648. The cubic root of 1398027961 is about 1118.1634337790.

It can be divided in two parts, 13980 and 27961, that multiplied together give a triangular number (390894780 = T₂₇₉₆₀).

The spelling of 1398027961 in words is "one billion, three hundred ninety-eight million, twenty-seven thousand, nine hundred sixty-one".